求二元一次方程或不等式的应用题及答案 求225道二元一次方程题和不等式,不等式组的计算题(带完整答...
\u4e00\u5143\u4e00\u6b21\u4e0d\u7b49\u5f0f\u548c\u4e8c\u5143\u4e00\u6b21\u65b9\u7a0b\u7684\u5e94\u7528\u9898\u540420\u9053\uff08\u4f8b\u9898\uff09\u4e0d\u7b49\u5f0f\u7ec4: 1\u3001\u4e00\u4e2a\u957f\u65b9\u5f62\u8db3\u7403\u573a\u7684\u957f\u4e3aX\u7c73\uff0c\u5bbd\u4e3a70\u7c73\uff0c\u5982\u679c\u5b83\u7684\u5468\u957f\u5927\u4e8e350\u7c73\uff0c\u9762\u79ef\u5c0f\u4e8e7650\u5e73\u65b9\u7c73\uff0c\u6c42X\u7684\u53d6\u503c\u8303\u56f4\uff0c\u5e76\u5224\u65ad\u8fd9\u4e2a\u7403\u573a\u662f\u5426\u53ef\u4ee5\u4f5c\u4e3a\u56fd\u9645\u8db3\u7403\u6bd4\u8d5b\uff08\u6ce8\uff1a\u7528\u4e8e\u56fd\u9645\u6bd4\u8d5b\u7684\u8db3\u7403\u573a\u7684\u957f\u5728100\u81f3110\u7c73\u4e4b\u95f4\uff0c\u5bbd\u572864\u81f375\u7c73\u4e4b\u95f4\u3002\uff09
2\u3001\u5728\u5bb9\u5668\u91cc\u670918\u6444\u793a\u5ea6\u7684\u6c346\u7acb\u65b9\u7c73\uff0c\u73b0\u5728\u8981\u628a8\u7acb\u65b9\u7c73\u7684\u6c34\u6ce8\u5165\u91cc\u9762\uff0c\u4f7f\u5bb9\u5668\u91cc\u6df7\u5408\u7684\u6c34\u7684\u6e29\u5ea6\u4e0d\u4f4e\u4e8e30\u6444\u793a\u5ea6\uff0c\u4e14\u4e0d\u9ad8\u4e8e36\u6444\u793a\u5ea6\uff0c\u6c42\u6ce8\u5165\u76848\u7acb\u65b9\u7c73\u7684\u6c34\u7684\u6e29\u5ea6\u5e94\u8be5\u5728\u4ec0\u4e48\u8303\u56f4\uff1f
3\u3001\u6709\u7ea2\u3001\u767d\u989c\u8272\u7684\u7403\u82e5\u5e72\u4e2a\uff0c\u5df2\u77e5\u767d\u7403\u7684\u4e2a\u6570\u6bd4\u7ea2\u7403\u5c11\uff0c\u4f46\u767d\u7403\u7684\u4e24\u500d\u6bd4\u7ea2\u7403\u591a\uff0c\u82e5\u628a\u6bcf\u4e00\u4e2a\u767d\u7403\u90fd\u8bb0\u4f5c\u65702\uff0c\u6bcf\u4e00\u4e2a\u7ea2\u7403\u90fd\u8bb0\u4f5c\u65703\uff0c\u5219\u603b\u6570\u4e3a60\uff0c\u6c42\u767d\u7403\u548c\u7ea2\u7403\u5404\u51e0\u4e2a\uff1f
4\u3001\u4e00\u6b21\u8003\u8bd5\u5171\u670925\u9053\u9009\u62e9\u9898\uff0c\u505a\u5bf9\u4e00\u9898\u5f974\u5206\uff0c\u505a\u9519\u4e00\u9898\u51cf2\u5206\uff0c\u4e0d\u505a\u5f970\u5206\uff0c\u82e5\u5c0f\u660e\u60f3\u786e\u4fdd\u8003\u8bd5\u6210\u7ee9\u572860\u5206\u4ee5\u4e0a\uff0c\u90a3\u4e48\uff0c\u4ed6\u81f3\u5c11\u505a\u5bf9X\u9898\uff0c\u5e94\u6ee1\u8db3\u7684\u4e0d\u7b49\u5f0f\u662f\u4ec0\u4e48\uff1f
5\u3001\u67d0\u516c\u53f8\u9700\u523b\u5f55\u4e00\u6279\u5149\u76d8\uff08\u603b\u6570\u4e0d\u8d85\u8fc7100\u5f20\uff09\uff0c\u82e5\u8bf7\u4e13\u4e1a\u516c\u53f8\u523b\u5f55\uff0c\u6bcf\u5f20\u970010\u5143\uff08\u5305\u62ec\u7a7a\u767d\u5149\u76d8\u8d39\uff09\uff1b\u82e5\u516c\u53f8\u81ea\u523b\uff0c\u9664\u8bbe\u5907\u79df\u7528\u8d39200\u5143\u4ee5\u5916\uff0c\u6bcf\u5f20\u8fd8\u9700\u6210\u672c5\u5143\uff08\u7a7a\u767d\u5149\u76d8\u8d39\uff09\u3002\u95ee\u523b\u5f55\u8fd9\u6279\u5149\u76d8\uff0c\u662f\u8bf7\u4e13\u5bb6\u516c\u53f8\u523b\u5f55\u8d39\u7528\u7701\uff0c\u8fd8\u662f\u81ea\u523b\u8d39\u7528\u7701\uff1f
7\u3001\u67d0\u5bbe\u9986\u4e00\u697c\u5ba2\u623f\u6bd4\u4e8c\u697c\u5c115\u95f4\uff0c\u67d0\u65c5\u6e38\u56e2\u670948\u4eba\uff0c\u82e5\u5168\u90e8\u5b89\u6392\u5728\u4e00\u697c\uff0c\u6bcf\u95f44\u4eba\uff0c\u623f\u95f4\u4e0d\u591f\uff0c\u6bcf\u95f45\u4eba\uff0c\u623f\u95f4\u6ca1\u6709\u4f4f\u6ee1\uff1b\u82e5\u5b89\u6392\u4f4f\u5728\u4e8c\u697c\uff0c\u6bcf\u95f43\u4eba\u623f\u95f4\u4e0d\u591f\uff0c\u6bcf\u95f44\u4eba\uff0c\u6709\u623f\u95f4\u6ca1\u4f4f\u6ee1\uff0c\u95ee\u5bbe\u9986\u4e00\u697c\u6709\u5ba2\u623f\u51e0\u95f4
8\u628a\u4e00\u4e9b\u4e66\u5206\u7ed9\u51e0\u4e2a\u5b66\u751f\uff0c\u5982\u679c\u6bcf\u4eba\u52063\u672c\uff0c\u90a3\u4e48\u4f598\u672c\uff1b
\u5982\u679c\u524d\u9762\u7684\u6bcf\u4e2a\u5b66\u751f\u52065\u672c\uff0c\u90a3\u4e48\u6700\u540e\u4e00\u4eba\u5c31\u5206\u4e0d\u52303\u672c.
\u8bf7\u95ee\u8fd9\u4e9b\u4e66\u6709\u591a\u5c11\u672c\uff1f\u5b66\u751f\u6709\u591a\u5c11\u4eba
9.\u5e7c\u513f\u56ed\u51e0\u4e2a\u5c0f\u5b69\u5206\u4e00\u7bb1\u82f9\u679c\uff0c\u5982\u679c\u6bcf\u4eba\u52063\u4e2a\uff0c\u90a3\u4e48\u4f597\u4e2a\uff1b\u5982\u679c\u6bcf\u4eba\u52065\u4e2a\uff0c\u90a3\u4e48\u67091\u4eba\u5206\u5f97\u5f97\u82f9\u679c\u4e0d\u8db35\u4e2a\uff0c\u95ee\u6709\u591a\u5c11\u5c0f\u5b69\uff1f\u591a\u5c11\u82f9\u679c
10\u5c0f\u653e\u5bb6\u6bcf\u6708\u6c34\u8d39\u4e0d\u5c11\u4e8e15\u5143,\u81ea\u6765\u6c34\u516c\u53f8\u89c4\u5b9a:\u82e5\u6bcf\u6237\u6bcf\u6708\u7528\u6c34\u4e0d\u8d85\u8fc75\u7acb\u65b9\u7c73,\u5219\u6bcf\u7acb\u65b9\u7c73\u65361\u30018\u5143\uff0c\u82e5\u6bcf\u6237\u6bcf\u6708\u7528\u6c34\u8d85\u8fc75\u7acb\u65b9\u7c73\uff0c\u5219\u8d85\u51fa\u90e8\u5206\u6bcf\u7acb\u65b9\u7c732\u5143\uff0c\u5c0f\u653e\u5bb6\u7528\u6c34\u81f3\u5c11\u662f\u591a\u5c11
11\u7532\u4e59\u4e24\u961f\u5f00\u5c55\u8db3\u7403\u6bd4\u8d5b\uff0c\u89c4\u5b9a\u6bcf\u961f\u80dc\u4e00\u573a\u5f973\u5206\uff0c\u5e73\u4e00\u573a\u5f971\u5206\uff0c\u8d1f\u4e00\u573a\u5f970\u5206\uff0c\u4e24\u961f\u4e00\u5171\u8d5b\u4e8610\u573a\uff0c\u7532\u961f\u4fdd\u6301\u4e0d\u8d25\u8bb0\u5f55\uff0c\u5f97\u5206\u8d85\u8fc7\u4e8622\u5206\uff0c\u95ee\u7532\u961f\u81f3\u5c11\u80dc\u4e86\u591a\u5c11\u573a\uff1f
12\u7528\u6bcf\u5206\u65f6\u95f4\u53ef\u62bd1.1\u5428\u6c34\u7684A\u578b\u62bd\u6c34\u673a\u6765\u62bd\u6c60\u6c34,\u534a\u5c0f\u65f6\u53ef\u4ee5\u62bd\u5b8c\uff1b
\u5982\u679c\u7528B\u578b\u62bd\u6c34\u673a\uff0c\u4f30\u8ba120\u5206\u81f322\u5206\u53ef\u4ee5\u62bd\u5b8c.B\u578b\u62bd\u6c34\u673a\u6bd4A\u578b\u62bd
\u6c34\u673a\u6bcf\u5206\u949f\u7ea6\u591a\u62bd\u591a\u5c11\u5428\u6c34\uff1f
13.\u5b66\u6821\u6392\u7403\u6bd4\u8d5b,4\u4e2a\u73ed\u5728\u540c\u7ec4\u4e2d\u8fdb\u884c\u5355\u5faa\u73af\u8d5b,\u6210\u7ee9\u6700\u5dee\u7684\u88ab\u6dd8\u6c70,\u5982\u679c\u6392\u5728\u6700\u540e\u7684\u51e0\u4e2a\u73ed\u80dc\u8d1f\u573a\u6570\u76f8\u7b49,\u90a3\u4ed6\u4eec\u5c06\u518d\u8fdb\u884c\u9644\u52a0\u8d5b.\u521d\u4e00(1)\u73ed\u5728\u6bd4\u8d5b\u4e2d\u81f3\u5c11\u80fd\u80dc\u4e00\u573a,\u8fd9\u4e2a\u73ed\u662f\u5426\u53ef\u4ee5\u786e\u4fdd\u5728\u9644\u52a0\u8d5b\u4e4b\u524d\u4e0d\u88ab\u6dd8\u6c70?\u662f\u5426\u4e00\u5b9a\u51fa\u7ebf?\u4e3a\u4ec0\u4e48?
14\u7528\u82e5\u5e72\u8f86\u91cd\u91cf\u4e3a8\u5428\u7684\u6c7d\u8f66\u8fd0\u4e00\u6279\u8d27\u7269\uff0c\u82e5\u6bcf\u8f86\u8f66\u4e4b\u88c54\u5428\uff0c\u5219\u5269\u4e0b20\u5428\u8d27\u7269\uff1b\u82e5\u6ca1\u4eae\u7740\u88c5\u6ee18\u5428\uff0c\u5219\u6700\u540e\u4e00\u8f86\u8f66\u4e0d\u6ee1\u4e5f\u4e0d\u7a7a\uff0c\u95ee:\u6709\u591a\u5c11\u8f86\u8f66\uff1f
15\u67d0\u57ce\u5e02\u7684\u51fa\u79df\u8f66\u8d77\u6b65\u4ef7\u4e3a10\u5143\uff08\u65e2\u884c\u9a76\u8ddd\u79bb\u57285\u5343\u7c73\u4ee5\u5185\u90fd\u9700\u4ed810\u5143\u8d39\uff09\uff0c\u8fbe\u5230\u6216\u8d85\u8fc75\u5343\u7c73\u540e\uff0c\u6bcf\u884c\u9a761\u5343\u7c73\u4ef71.2\u5143(\u4e0d\u505a\u4e00\u5343\u7c73\u4e5f\u63091\u5343\u7c73\u8ba1).\u73b0\u5728\u67d0\u4eba\u4e58\u8f66\u4ece\u7532\u5730\u5230\u4e59\u5730,\u652f\u4ed8\u8f66\u8d3917.2\u5143,\u95ee\u4ece\u7532\u5730\u5230\u4e59\u5730\u7684\u8def\u7a0b\u5927\u7ea6\u662f\u591a\u5c11?
16\u521d\u4e8c\u5e74\u7ea7\u79cb\u6e38,\u82e5\u79df\u752848\u5ea7\u5ba2\u8f66\u82e5\u5e72\u8f86,\u5219\u6b63\u597d\u5750\u6ee1;\u82e5\u79df\u752864\u5ea7\u5ba2\u8f66,\u5219\u80fd\u5c11\u79df\u4e00\u8f86,\u4e14\u6709\u4e00\u8f86\u8f66\u6bcf\u6709\u5ea7\u6ee1,\u4f46\u8d85\u8fc7\u4e00\u534a.\u4e00\u76f4\u79df\u752848\u5ea7\u5ba2\u8f66\u6bcf\u8f86250\u5143,\u79df\u752864\u5ea7\u5ba2\u8f66\u6bcf\u8f86300\u5143,\u95ee\u5e94\u79df\u7528\u54ea\u79cd\u5ba2\u8f66\u8f83\u5408\u7b97?
17 \u628a\u4e00\u7bee\u82f9\u679c\u5206\u7ed9\u51e0\u4e2a\u5b66\u751f\uff0c\u5982\u679c\u6bcf\u4eba\u52064\u4e2a\uff0c\u5219\u5269\u4e0b3\u4e2a\uff1b\u5982\u679c\u6bcf\u4eba\u52066\u4e2a\uff0c\u5219\u6700\u540e\u4e00\u4e2a\u5b66\u751f\u6700\u591a\u5f972\u4e2a\uff0e\u6c42\u5b66\u751f\u4eba\u6570\u548c\u82f9\u679c\u6570\uff0e
18\u67d0\u5bbe\u9986\u4e00\u697c\u5ba2\u623f\u6bd4\u4e8c\u697c\u5c115\u95f4\uff0c\u67d0\u65c5\u6e38\u56e248\u4eba\uff0c\u82e5\u5b89\u6392\u4f4f\u4e00\u697c\uff0c\u6bcf\u95f4\u4f4f4\u4eba\uff0c\u623f\u95f4\u4e0d\u591f\uff1b\u6bcf\u95f4\u4f4f5\u4eba\uff0c\u6709\u623f\u95f4\u6ca1\u6709\u4f4f\u6ee15\u4eba\uff1b\u53c8\u82e5\u5168\u5b89\u6392\u4f4f\u4e8c\u697c\uff0c\u6bcf\u95f4\u4f4f3\u4eba\uff0c\u623f\u95f4\u4e0d\u591f\uff1b\u6bcf\u95f4\u4f4f4\u4eba\uff0c\u6709\u623f\u95f4\u6ca1\u6709\u4f4f\u6ee14\u4eba\uff0e\u95ee\u8be5\u5bbe\u9986\u4e00\u697c\u6709\u5ba2\u623f\u591a\u5c11\u95f4\uff1f
19 \u5c06\u82e5\u5e72\u53ea\u9e21\u653e\u5165\u82e5\u5e72\u4e2a\u7b3c\uff0c\u82e5\u6bcf\u4e2a\u7b3c\u91cc\u653e4\u53ea\uff0c\u5219\u6709\u4e00\u53ea\u9e21\u65e0\u7b3c\u53ef\u653e\uff1b\u82e5\u6bcf\u4e2a\u7b3c\u91cc\u653e5\u53ea\uff0c\u5219\u6709\u4e00\u7b3c\u65e0\u9e21\u53ef\u653e\uff0c\u90a3\u4e48\u81f3\u5c11\u6709\u51e0\u53ea\u9e21\u51e0\u4e2a\u7b3c\uff1f
20\u7532\u3001\u4e59\u4e24\u8f66\u95f4\u5404\u6709\u82e5\u5e72\u4e2a\u5de5\u4eba\u751f\u4ea7\u540c\u4e00\u79cd\u96f6\u4ef6\uff0c\u7532\u8f66\u95f4\u67091\u4e2a\u4eba\u6bcf\u5929\u751f\u4ea76\u4ef6\uff0c\u5176\u4f59\u6bcf\u4eba\u6bcf\u5929\u751f\u4ea711\u4ef6\uff1b\u4e59\u8f66\u95f4\u67091\u4eba\u6bcf\u5929\u751f\u4ea77\u4ef6\uff0c\u5176\u4f59\u6bcf\u4eba\u6bcf\u5929\u751f\u4ea710\u4ef6\uff0e\u5df2\u77e5\u4e24\u8f66\u95f4\u6bcf\u5929\u751f\u4ea7\u96f6\u4ef6\u7684\u603b\u6570\u76f8\u7b49\uff0c\u4e14\u6bcf\u4e2a\u8f66\u95f4\u6bcf\u5929\u751f\u4ea7\u96f6\u4ef6\u603b\u6570\u4e0d\u5c11\u4e8e100\u4ef6\u4e5f\u4e0d\u8d85\u8fc7200\u4ef6\uff0c\u5219\u7532\u8f66\u95f4\u6709\u591a\u5c11\u4eba\uff0c\u4e59\u8f66\u95f4\u6709\u591a\u5c11\u4eba\uff1f
\u65b9\u7a0b:1\u67d0\u6821\u52a0\u5de5\u5382\u6709\u5de5\u4eba60\u540d,\u751f\u4ea7\u67d0\u79cd\u4e00\u4e2a\u87ba\u6813\u5957\u4e24\u4e2a\u87ba\u6bcd\u7684\u914d\u5957\u4ea7\u54c1,\u6bcf\u4eba\u6bcf\u5929\u5e73\u5747\u751f\u4ea7\u87ba\u681314\u4e2a\u6216\u87ba\u6bcd20\u4e2a,\u5e94\u5206\u914d\u591a\u5c11\u4eba\u751f\u4ea7\u87ba\u6813,\u591a\u5c11\u4eba\u751f\u4ea7\u87ba\u6bcd,\u80fd\u4f7f\u751f\u4ea7\u51fa\u7684\u87ba\u6813\u548c\u87ba\u6bcd\u521a\u597d\u914d\u5957 ?
2 3\u8f86\u5c0f\u8d27\u8f66\u548c6\u8f86\u5361\u8f66\u4e00\u6b21\u80fd\u8fd0\u8d27\u726932\u5428,10\u8f86\u5c0f\u8d27\u8f66\u548c3\u8f86\u5361\u8f66\u4e00\u6b21\u80fd\u8fd0\u8d27\u726928\u5428,1\u8f86\u5c0f\u8d27\u8f66\u548c1\u8f86\u5361\u8f66\u4e00\u6b21\u5404\u8fd0\u8d27\u7269\u591a\u5c11\u5428 ?
3 \u6709\u5927\u5c0f\u4e24\u79cd\u8d27\u8f66,2\u8f86\u5927\u8f66\u548c3\u8f86\u5c0f\u8f66\u4e00\u6b21\u53ef\u4ee5\u8fd0\u8d2715.5\u5428,5\u8f86\u5927\u8f66\u548c6\u8f86\u5c0f\u8f66\u4e00\u6b21\u53ef\u4ee5\u8fd0\u8d2735\u5428,\u6c423\u8f86\u5927\u8f66\u548c5\u8f86\u5c0f\u8f66\u4e00\u6b21\u53ef\u4ee5\u8fd0\u8d27\u591a\u5c11\u5428 ?
4 \u9769\u547d\u8001\u533a\u67d0\u8292\u679c\u79cd\u690d\u57fa\u5730,\u53bb\u5e74\u7ed3\u4f59\u4e3a500\u4e07\u5143,\u4f30\u8ba1\u4eca\u5e74\u53ef\u7ed3\u4f59980\u4e07\u5143,\u5e76\u4e14\u4eca\u5e74\u7684\u6536\u5165\u6bd4\u53bb\u5e74\u9ad815%,\u652f\u51fa\u6bd4\u53bb\u5e74\u4f4e10%,\u6c42\u53bb\u5e74\u7684\u6536\u5165\u4e0e\u652f\u51fa\u5404\u662f\u591a\u5c11\u4e07\u5143 ?
5 \u7535\u8111\u516c\u53f8\u4e3a\u4e86\u6269\u5927\u7ecf\u8425\u89c4\u6a21,\u5411\u94f6\u884c\u7533\u8bf7\u4e86\u7532 ,\u4e59\u4e24\u79cd\u8d37\u6b3e,\u5171\u8ba1300\u4e07\u5143,\u6bcf\u5e74\u9700\u4ed8\u5229\u606f\u4e3a21.3\u4e07\u5143. \u5df2\u77e5\u7532\u79cd\u8d37\u6b3e\u6bcf\u5e74\u7684\u5e74\u5229\u7387\u4e3a7.2%,\u4e59\u79cd\u8d37\u6b3e\u6bcf\u5e74\u7684\u5e74\u5229\u7387\u4e3a6.9%,\u90a3\u4e48\u8be5\u5382\u7532,\u4e59\u4e24\u79cd\u8d37\u6b3e\u7684\u6570\u989d\u5404\u662f\u591a\u5c11 ?
6 \u5c0f\u660e\u4ee5\u4e24\u79cd\u65b9\u5f0f\u50a8\u84c4\u4e86\u538b\u5c81\u94b12000\u5143,\u5176\u4e2d\u4e00\u79cd\u662f\u5e74\u5229\u7387\u4e3a2.25%\u7684\u6559\u80b2\u50a8\u84c4,\u53e6\u4e00\u79cd\u662f\u5e74\u5229\u7387\u4e3a2.25%\u4f46\u8981\u6263\u966420%\u7684\u5229\u606f\u6240\u5f97\u7a0e\u7684\u4e00\u5e74\u671f\u5b9a\u671f\u5b58\u6b3e,\u4e00\u5e74\u540e\u5171\u5f97\u5230\u5229\u606f42.75\u5143,\u6c42\u8fd9\u4e24\u79cd\u50a8\u84c4\u5404\u5b58\u4e86\u591a\u5c11\u94b1 ?
7 \u67d0\u5546\u573a\u8d2d\u8fdb\u5546\u54c1\u540e,\u52a0\u4ef740%\u4f5c\u4e3a\u9500\u552e\u4ef7,\u5546\u573a\u641e\u4f18\u60e0\u4fc3\u9500,\u51b3\u5b9a\u7532,\u4e59\u4e24\u79cd\u5546\u54c1\u5206\u522b7\u6298\u548c9\u6298\u9500\u552e,\u67d0\u987e\u5ba2\u8d2d\u4e70\u7532\u4e59\u4e24\u79cd\u5546\u54c1,\u5171\u4ed8\u6b3e399\u5143,\u8fd9\u4e24\u79cd\u5546\u54c1\u539f\u9500\u552e\u4ef7\u4e4b\u548c\u4e3a490\u5143,\u95ee\u8fd9\u4e24\u79cd\u5546\u54c1\u8fdb\u4ef7\u5206\u522b\u4e3a\u591a\u5c11\u5143 ?
8 \u6709\u4e00\u4e2a\u4e24\u4f4d\u6570,\u5341\u4f4d\u4e0a\u7684\u6570\u6bd4\u4e2a\u4f4d\u4e0a\u7684\u6570\u5c0f1,\u5341\u4f4d\u4e0a\u7684\u6570\u4e0e\u4e2a\u4f4d\u4e0a\u7684\u6570\u7684\u548c\u662f\u8fd9\u4e2a\u4e24\u4f4d\u6570\u76841/5,\u6c42\u8fd9\u4e2a\u4e24\u4f4d\u6570.
9 \u4e00\u4e2a\u4e09\u4f4d\u6570\u7684\u4e2a\u4f4d\u6570\u5b57\u662f7,\u5341\u4f4d\u6570\u5b57\u4e0e\u767e\u4f4d\u6570\u5b57\u4e4b\u548c\u4e3a3,\u82e5\u628a\u4e2a\u4f4d\u6570\u5b57\u79fb\u5230\u9996\u4f4d,\u5219\u65b0\u6570\u6bd4\u539f\u6570\u76845\u500d\u8fd8\u591a77,\u6c42\u8fd9\u4e2a\u4e09\u4f4d\u6570.
10 \u7532,\u4e59\u4e24\u961f\u5408\u505a\u4e00\u9879\u5de5\u7a0b,12\u5929\u53ef\u4ee5\u5b8c\u6210, \u5982\u679c\u7532\u5148\u505a5\u5929\u540e,\u4e59\u624d\u8d76\u6765\u53c2\u52a0,\u4e24\u4eba\u5408\u505a9\u5929\u624d\u80fd\u5b8c\u6210,\u5219\u7532,\u4e59\u72ec\u505a\u5404\u9700\u8981\u591a\u5c11\u5929\u5b8c\u6210\u8fd9\u9879\u5de5\u7a0b ?
11 \u7532\u4e59\u4e24\u4eba\u9a91\u81ea\u884c\u8f66\u4ece\u76f8\u8ddd34.5KM\u7684\u4e24\u5730\u76f8\u5411\u51fa\u53d1,\u5728\u7532\u8d70\u4e861.5H,\u4e59\u8d70\u4e862 H\u540e\u76f8\u9047; \u7b2c\u4e8c\u6b21\u4ed6\u4eec\u540c\u65f6\u4ece\u4e24\u5730\u76f8\u5411\u51fa\u53d1,\u7ecf\u8fc75/4H,\u4e24\u4e2a\u8fd8\u76f8\u8ddd9.5KM,\u6c42\u7532,\u4e59\u4e24\u4eba\u9a91\u81ea\u884c\u8f66\u7684\u901f\u5ea6.
12 A,B\u4e24\u5730\u76f8\u8ddd20KM,\u7532\u4eceA\u5730\u5411B\u5730\u524d\u8fdb,\u540c\u65f6\u4e59\u4eceB\u5730\u5411A\u5730\u524d\u8fdb,2 H\u540e\u4e8c\u4eba\u5728\u9014\u4e2d\u76f8\u9047, \u76f8\u9047\u540e\u7532\u8fd4\u56deA\u5730,\u4e59\u4ecd\u5411A\u5730\u524d\u8fdb,\u7532\u56de\u5230A\u5730\u65f6,\u4e59\u79bbA\u5730\u8fd8\u67092KM,\u6c42\u7532,\u4e59\u4e8c\u4eba\u7684\u901f\u5ea6
13\u6709\u7532\u4e59\u4e24\u79cd\u503a\u5238\uff0c\u5e74\u5229\u7387\u5206\u522b\u662f10%\u4e0e12%\uff0c\u73b0\u6709400\u5143\u503a\u5238\uff0c\u4e00\u5e74\u540e\u83b7\u522945\u5143\uff0c\u95ee\u4e24
\u79cd\u503a\u5238\u5404\u6709\u591a\u5c11\uff1f\uff086\u5206\uff09
14 \u4e00\u79cd\u996e\u6599\u5927\u5c0f\u5305\u88c5\u67093\u79cd\uff0c1\u4e2a\u4e2d\u74f6\u6bd42\u5c0f\u74f6\u4fbf\u5b9c2\u89d2\uff0c1\u4e2a\u5927\u74f6\u6bd41\u4e2a\u4e2d\u74f6\u52a01\u4e2a\u5c0f\u74f6\u8d354\u89d2\uff0c\u5927\u3001\u4e2d\u3001\u5c0f\u5404\u4e701\u74f6\uff0c\u97009\u51436\u89d2\u30023\u79cd\u5305\u88c5\u7684\u996e\u6599\u6bcf\u74f6\u5404\u591a\u5c11\u5143\uff1f
15 \u725f\u73ed\u540c\u5b66\u53bb18\u5343\u7c73\u7684\u5317\u5c71\u90ca\u6e38\u3002\u53ea\u6709\u4e00\u8f86\u6c7d\u8f66\uff0c\u9700\u5206\u4e24\u7ec4\uff0c\u7532\u7ec4\u5148\u4e58\u8f66\u3001\u4e59\u7ec4\u6b65\u884c\u3002\u8f66\u884c\u81f3A\u5904\uff0c\u7532\u7ec4\u4e0b\u8f66\u6b65\u884c\uff0c\u6c7d\u8f66\u8fd4\u56de\u63a5\u4e59\u7ec4\uff0c\u6700\u540e\u4e24\u7ec4\u540c\u65f6\u8fbe\u5230\u5317\u5c71\u7ad9\u3002\u5df2\u77e5\u6c7d\u8f66\u901f\u5ea6\u662f60\u5343\u7c73/\u65f6\uff0c\u6b65\u884c\u901f\u5ea6\u662f4\u5343\u7c73/\u65f6\uff0c\u6c42A\u70b9\u8ddd\u5317\u5c71\u7ad9\u7684\u8ddd\u79bb\u3002
16\u7532\u4e59\u4e24\u5de5\u5382\u8ba1\u5212\u4e00\u5e74\u5171\u751f\u4ea7\u673a\u5e8a360\u53f0\uff0c\u5b9e\u9645\u4e0a\u7532\u5382\u5b8c\u6210\u4e86\u8ba1\u5212\u7684112%\uff0c\u4e59\u5382\u5b8c\u6210\u4e86\u8ba1\u5212\u7684110%\uff0c\u5b9e\u9645\u4e24\u5382\u751f\u4ea7\u673a\u5e8a400\u53f0\uff0c\u6c42\u7532\u3001\u4e59\u4e24\u5382\u8ba1\u5212\u751f\u4ea7\u673a\u5e8a\u591a\u5c11\u53f0\uff1f
17\u4e24\u4e2a\u7f38\u5185\u4e00\u5171\u670948\u6876\u6c34\uff0c\u82e5\u7528\u7532\u7f38\u7684\u6c34\u7ed9\u4e59\u7f38\u52a0\u6c34\u4e00\u500d\uff0c\u7136\u540e\u53c8\u7528\u4e59\u7f38\u7684\u6c34\u7ed9\u7532\u7f38\u52a0\u5165\u7532\u7f38\u5269\u4f59\u6c34\u7684\u4e00\u500d\uff0c\u5219\u7532\u3001\u4e59\u4e24\u7f38\u7684\u6c34\u91cf\u76f8\u7b26\uff0c\u6c42\u6700\u521d\u7532\u3001\u4e59\u4e24\u7f38\u5185\u5404\u6709\u591a\u5c11\u6876\u6c34\uff1f
18\u7532\u4e59\u4e24\u4eba\u5df2\u4e0d\u53d8\u7684\u901f\u5ea6\u5728\u73af\u884c\u8def\u4e0a\u8dd1\u6b65\uff0c\u76f8\u5411\u800c\u884c\uff0c\u6bcf\u96942\u5206\u949f\u76f8\u9047\u4e00\u6b21\uff1b\u540c\u5411\u800c\u884c\uff0c\u6bcf\u96946\u5206\u949f\u76f8\u9047\u4e00\u6b21\uff0c\u5df2\u77e5\u7532\u6bd4\u4e59\u8dd1\u5f97\u5feb\u3002\u6c42\u7532\u4e59\u6bcf\u5206\u949f\u8dd1\u591a\u5c11\u5708\uff1f
19\u201c\u8fce\u6625\u676f\u201d\u6570\u5b66\u7ade\u8d5b\u5171\u670910\u9053\u9898\uff0c\u5c0f\u660e\u5f97\u4e8677\u5206\uff0c\u5e76\u4e14\u6bcf\u9053\u9898\u90fd\u505a\u4e86\uff0c\u4f46\u4ed6\u89c9\u5f97\u5206\u6570\u4e0e\u4ed6\u7684\u81ea\u6211\u8bc4\u4f30\u6709\u70b9\u5c0f\u5dee\u8ddd\uff0c\u5df2\u77e5\u6bcf\u9053\u989810\u5206\uff0c\u4e0d\u505a\u626310\u5206\uff0c\u82e5\u505a\u5bf9\u4e00\u90e8\u5206\u53ef\u5f973\u5206\uff0c\u73b0\u5728\u8bf7\u4f60\u5e2e\u4ed6\u4f30\u7b97\u4e00\u4e0b\uff0c\u5c0f\u660e\u7684\u5b9e\u9645\u5f97\u5206\u60c5\u51b5\u5982\u4f55\uff1f
20\u67d0\u4f5c\u4e1a\u7ec4\u8981\u5728\u89c4\u5b9a\u65f6\u95f4\u5185\u5b8c\u6210\u4e00\u9879\u5de5\u7a0b\uff0c\u5982\u679c\u589e\u52a02\u540d\u5de5\u4eba\uff0c\u90a3\u4e48\u53ef\u63d0\u524d2\u5929\u5b8c\u6210\uff1b\u5982\u679c\u51cf\u5c113\u540d\u5de5\u4eba\uff0c\u5c31\u8981\u63a8\u8fdf6\u5929\u5b8c\u6210\uff0c\u95ee\uff1a\u8fd9\u4e2a\u4f5c\u4e1a\u7ec4\u539f\u6709\u591a\u5c11\u4eba\uff1f\u89c4\u5b9a\u5b8c\u6210\u5de5\u4f5c\u7684\u65f6\u95f4\u662f\u591a\u5c11\u5929\uff1f
\uff081) 66x+17y=3967
25x+y=1200
\u7b54\u6848\uff1ax=48 y=47
(2) 18x+23y=2303
74x-y=1998
\u7b54\u6848\uff1ax=27 y=79
(3) 44x+90y=7796
44x+y=3476
\u7b54\u6848\uff1ax=79 y=48
(4) 76x-66y=4082
30x-y=2940
\u7b54\u6848\uff1ax=98 y=51
(5) 67x+54y=8546
71x-y=5680
\u7b54\u6848\uff1ax=80 y=59
(6) 42x-95y=-1410
21x-y=1575
\u7b54\u6848\uff1ax=75 y=48
(7) 47x-40y=853
34x-y=2006
\u7b54\u6848\uff1ax=59 y=48
(8) 19x-32y=-1786
75x+y=4950
\u7b54\u6848\uff1ax=66 y=95
(9) 97x+24y=7202
58x-y=2900
\u7b54\u6848\uff1ax=50 y=98
(10) 42x+85y=6362
63x-y=1638
\u7b54\u6848\uff1ax=26 y=62
(11) 85x-92y=-2518
27x-y=486
\u7b54\u6848\uff1ax=18 y=44
(12) 79x+40y=2419
56x-y=1176
\u7b54\u6848\uff1ax=21 y=19
(13) 80x-87y=2156
22x-y=880
\u7b54\u6848\uff1ax=40 y=12
(14) 32x+62y=5134
57x+y=2850
\u7b54\u6848\uff1ax=50 y=57
(15) 83x-49y=82
59x+y=2183
\u7b54\u6848\uff1ax=37 y=61
(16) 91x+70y=5845
95x-y=4275
\u7b54\u6848\uff1ax=45 y=25
(17) 29x+44y=5281
88x-y=3608
\u7b54\u6848\uff1ax=41 y=93
(18) 25x-95y=-4355
40x-y=2000
\u7b54\u6848\uff1ax=50 y=59
(19) 54x+68y=3284
78x+y=1404
\u7b54\u6848\uff1ax=18 y=34
(20) 70x+13y=3520
52x+y=2132
\u7b54\u6848\uff1ax=41 y=50
(21) 48x-54y=-3186
24x+y=1080
\u7b54\u6848\uff1ax=45 y=99
(22) 36x+77y=7619
47x-y=799
\u7b54\u6848\uff1ax=17 y=91
(23) 13x-42y=-2717
31x-y=1333
\u7b54\u6848\uff1ax=43 y=78
(24) 28x+28y=3332
52x-y=4628
\u7b54\u6848\uff1ax=89 y=30
(25) 62x-98y=-2564
46x-y=2024
\u7b54\u6848\uff1ax=44 y=54
(26) 79x-76y=-4388
26x-y=832
\u7b54\u6848\uff1ax=32 y=91
(27) 63x-40y=-821
42x-y=546
\u7b54\u6848\uff1ax=13 y=41
(28) 69x-96y=-1209
42x+y=3822
\u7b54\u6848\uff1ax=91 y=78
(29) 85x+67y=7338
11x+y=308
\u7b54\u6848\uff1ax=28 y=74
(30) 78x+74y=12928
14x+y=1218
\u7b54\u6848\uff1ax=87 y=83
(31) 39x+42y=5331
59x-y=5841
\u7b54\u6848\uff1ax=99 y=35
(32) 29x+18y=1916
58x+y=2320
\u7b54\u6848\uff1ax=40 y=42
(33) 40x+31y=6043
45x-y=3555
\u7b54\u6848\uff1ax=79 y=93
(34) 47x+50y=8598
45x+y=3780
\u7b54\u6848\uff1ax=84 y=93
(35) 45x-30y=-1455
29x-y=725
\u7b54\u6848\uff1ax=25 y=86
(36) 11x-43y=-1361
47x+y=799
\u7b54\u6848\uff1ax=17 y=36
(37) 33x+59y=3254
94x+y=1034
\u7b54\u6848\uff1ax=11 y=49
(38) 89x-74y=-2735
68x+y=1020
\u7b54\u6848\uff1ax=15 y=55
(39) 94x+71y=7517
78x+y=3822
\u7b54\u6848\uff1ax=49 y=41
(40) 28x-62y=-4934
46x+y=552
\u7b54\u6848\uff1ax=12 y=85
(41) 75x+43y=8472
17x-y=1394
\u7b54\u6848\uff1ax=82 y=54
(42) 41x-38y=-1180
29x+y=1450
\u7b54\u6848\uff1ax=50 y=85
(43) 22x-59y=824
63x+y=4725
\u7b54\u6848\uff1ax=75 y=14
(44) 95x-56y=-401
90x+y=1530
\u7b54\u6848\uff1ax=17 y=36
(45) 93x-52y=-852
29x+y=464
\u7b54\u6848\uff1ax=16 y=45
(46) 93x+12y=8823
54x+y=4914
\u7b54\u6848\uff1ax=91 y=30
(47) 21x-63y=84
20x+y=1880
\u7b54\u6848\uff1ax=94 y=30
(48) 48x+93y=9756
38x-y=950
\u7b54\u6848\uff1ax=25 y=92
(49) 99x-67y=4011
75x-y=5475
\u7b54\u6848\uff1ax=73 y=48
(50) 83x+64y=9291
90x-y=3690
\u7b54\u6848\uff1ax=41 y=92
(51) 17x+62y=3216
75x-y=7350
\u7b54\u6848\uff1ax=98 y=25
(52) 77x+67y=2739
14x-y=364
\u7b54\u6848\uff1ax=26 y=11
(53) 20x-68y=-4596
14x-y=924
\u7b54\u6848\uff1ax=66 y=87
(54) 23x+87y=4110
83x-y=5727
\u7b54\u6848\uff1ax=69 y=29
(55) 22x-38y=804
86x+y=6708
\u7b54\u6848\uff1ax=78 y=24
(56) 20x-45y=-3520
56x+y=728
\u7b54\u6848\uff1ax=13 y=84
(57) 46x+37y=7085
61x-y=4636
\u7b54\u6848\uff1ax=76 y=97
(58) 17x+61y=4088
71x+y=5609
\u7b54\u6848\uff1ax=79 y=45
(59) 51x-61y=-1907
89x-y=2314
\u7b54\u6848\uff1ax=26 y=53
(60) 69x-98y=-2404
21x+y=1386
\u7b54\u6848\uff1ax=66 y=71
(61) 15x-41y=754
74x-y=6956
\u7b54\u6848\uff1ax=94 y=16
(62) 78x-55y=656
89x+y=5518
\u7b54\u6848\uff1ax=62 y=76
(63) 29x+21y=1633
31x-y=713
\u7b54\u6848\uff1ax=23 y=46
(64) 58x-28y=2724
35x+y=3080
\u7b54\u6848\uff1ax=88 y=85
(65) 28x-63y=-2254
88x-y=2024
\u7b54\u6848\uff1ax=23 y=46
(66) 43x+50y=7064
85x+y=8330
\u7b54\u6848\uff1ax=98 y=57
(67) 58x-77y=1170
38x-y=2280
\u7b54\u6848\uff1ax=60 y=30
(68) 92x+83y=11586
43x+y=3010
\u7b54\u6848\uff1ax=70 y=62
(69) 99x+82y=6055
52x-y=1716
\u7b54\u6848\uff1ax=33 y=34
(70) 15x+26y=1729
94x+y=8554
\u7b54\u6848\uff1ax=91 y=14
(71) 64x+32y=3552
56x-y=2296
\u7b54\u6848\uff1ax=41 y=29
(72) 94x+66y=10524
84x-y=7812
\u7b54\u6848\uff1ax=93 y=27
(73) 65x-79y=-5815
89x+y=2314
\u7b54\u6848\uff1ax=26 y=95
(74) 96x+54y=6216
63x-y=1953
\u7b54\u6848\uff1ax=31 y=60
(75) 60x-44y=-352
33x-y=1452
\u7b54\u6848\uff1ax=44 y=68
(76) 79x-45y=510
14x-y=840
\u7b54\u6848\uff1ax=60 y=94
(77) 29x-35y=-218
59x-y=4897
\u7b54\u6848\uff1ax=83 y=75
(78) 33x-24y=1905
30x+y=2670
\u7b54\u6848\uff1ax=89 y=43
(79) 61x+94y=11800
93x+y=5952
\u7b54\u6848\uff1ax=64 y=84
(80) 61x+90y=5001
48x+y=2448
\u7b54\u6848\uff1ax=51 y=21
(81) 93x-19y=2
86x-y=1548
\u7b54\u6848\uff1ax=18 y=88
(82) 19x-96y=-5910
30x-y=2340
\u7b54\u6848\uff1ax=78 y=77
(83) 80x+74y=8088
96x-y=8640
\u7b54\u6848\uff1ax=90 y=12
(84) 53x-94y=1946
45x+y=2610
\u7b54\u6848\uff1ax=58 y=12
(85) 93x+12y=9117
28x-y=2492
\u7b54\u6848\uff1ax=89 y=70
(86) 66x-71y=-1673
99x-y=7821
\u7b54\u6848\uff1ax=79 y=97
(87) 43x-52y=-1742
76x+y=1976
\u7b54\u6848\uff1ax=26 y=55
(88) 70x+35y=8295
40x+y=2920
\u7b54\u6848\uff1ax=73 y=91
(89) 43x+82y=4757
11x+y=231
\u7b54\u6848\uff1ax=21 y=47
(90) 12x-19y=236
95x-y=7885
\u7b54\u6848\uff1ax=83 y=40
(91) 51x+99y=8031
71x-y=2911
\u7b54\u6848\uff1ax=41 y=60
(92) 37x+74y=4403
69x-y=6003
\u7b54\u6848\uff1ax=87 y=16
(93) 46x+34y=4820
71x-y=5183
\u7b54\u6848\uff1ax=73 y=43
(94) 47x+98y=5861
55x-y=4565
\u7b54\u6848\uff1ax=83 y=20
(95) 30x-17y=239
28x+y=1064
\u7b54\u6848\uff1ax=38 y=53
(96) 55x-12y=4112
79x-y=7268
\u7b54\u6848\uff1ax=92 y=79
(97) 27x-24y=-450
67x-y=3886
\u7b54\u6848\uff1ax=58 y=84
(98) 97x+23y=8119
14x+y=966
\u7b54\u6848\uff1ax=69 y=62
(99) 84x+53y=11275
70x+y=6790
\u7b54\u6848\uff1ax=97 y=59
(100) 51x-97y=297
19x-y=1520
\u7b54\u6848\uff1ax=80 y=39
1\u30012X+3\uff1e0 -3X+5\uff1e0
2\u30012X\uff1c-1 X+2\uff1e0
3\u30015X+6\uff1c3X 8-7X\uff1e4-5X
4\u30012\uff081+X\uff09\uff1e3\uff08X-7\uff09 4\uff082X-3\uff09\uff1e5\uff08X+2\uff09
5\u30012X\uff1c4 X+3\uff1e0
6\u30011-X\uff1e0 X+2\uff1c0
7\u30015+2X\uff1e3 X+2\uff1c8
8\u30012X+4\uff1c0 1/2\uff08X+8\uff09-2\uff1e0
9\u30015X-2\u22653\uff08X+1\uff09 1/2X+1\uff1e3/2X-3
10\u30011+1/2X\uff1e2
11\u30012\uff08X-3\uff09\u22644
12\u30013\u00d760 <= x <= 3\u00d770
解:甲x乙y
x-10=y+10
2(y-10)=x+10
x=70,y=50
2.甲乙两地相距21千米,如果相向而行1小时相遇,如果同向而行7小时乙追上甲。问甲乙速度
解:甲xkm/h,乙y
(x+y)=21
7(y-x)=21
x=9,y=12
3.一个长方形,把长减少3cm宽增加2cm就成了正方形,且2图形面积相等,球长和宽。
解:长x宽y
x-3=y+2
xy=(x-3)(y+2)
x=9,y=4
4.4辆小车和5辆大车客运货物27t,6辆小车和10辆大车客运货物51t.大车小车每辆分别可以云货物多少t?
解:大x小y
4x+5y=27
6x+10y=51
x=1.5,y=4.5
5.150人考试,平均分55,及格生平均分77,不及格的平均分47。问及格布几个各有多少人?
解:及格x不及格y
x+y=150
77x+47y=55*150
x=110,y=40
6.车间共有90人,一天每人可做12个甲零件或15个乙零件,怎样安排才可让零件正好配套(1甲配1乙)
解:x人做甲y人做乙
x+y=90
12x=15y
x=50,y=40
7.每3m布料可以做上衣2件或裤子3条,问600米布料可以做几套?(1衣1裤1套)
解:设做x件上衣y件裤子
x=y
3/2x+y=600
x=240,y=240可做240套
8.北京和上海都有某种仪器可供外地使用,其中北京可提供10台,上海可提供4台,已知重庆需要8台,武汉需要6台,从北京、上海将仪器运往重庆、武汉的费用如下表所示,有关部门计划用8000元运送这些仪器.请你设计一种方案,使武汉、重庆能得到所需的仪器,而且运费正好够用,又能否修改方案,降低整个运费?
武汉 重庆
北京 400 800
上海 300 500
解:设北京运往武汉x台,上海运武汉y台,由题意得
x+y=6
400x+800(10-x)+300y+500(4-y)=8000
x=4,y=2
即北京运往武汉4台,运往重庆6台,上海运往武汉2台,运往重庆2台.从运费表中可以看出北京运往重庆的单位运费最高,考虑运费减少北京运往重庆的台数,如北京运往重庆的台数减少为5台,此时,总运费为
400×5+800×5+300+500×3=7800,比原来降低了200元,还可以作适当调整,继续降低总运费.
10.学校图书馆搬迁,八年级(3)班学生参加了搬迁图书与整理图书的任务,开始时,参加搬运图书的人数比整理图书的人数的2倍少4人;后来,从搬运图书的同学中调出4人参加整理图书工作,这时两部分人数相等,求搬书、整书各多少人。
设参加搬运图书、整理图书的人数分别为x,y
x-2y=-4
x-y=8
x=20,y=12
不等式组:1、在容器里有18摄示度的水6立方米,现在要把8立方米的水注入里面,使容器里混合的水的温度不低于30摄示度,且不高于36摄示度,求注入的8立方米的水的温度应该在什么范围?
设注入水水温为X
(18*6+X*8)/(6+8)<36
(18*6+X*8)/(6+8)>30
2、有红、白颜色的球若干个,已知白球的个数比红球少,但白球的两倍比红球多,若把每一个白球都记作数2,每一个红球都记作数3,则总数为60,求白球和红球各几个?
设红球有X个,白球有Y个
Y<X
2Y>X
3X+2Y=60
3、一次考试共有25道选择题,做对一题得4分,做错一题减2分,不做得0分,若小明想确保考试成绩在60分以上,那么,他至少做对X题,应满足的不等式是什么?
设作对x题,那么做错或者不做了25-x题 4x -(25-x) =80 x=21
4、某宾馆一楼客房比二楼少5间,某旅游团有48人,若全部安排在一楼,每间4人,房间不够,每间5人,房间没有住满;若安排住在二楼,每间3人房间不够,每间4人,有房间没住满,问宾馆一楼有客房几间
设一楼x间 二楼y间
则:4x<48,5x>48
9+3/5<x<12.....故 x=10或11
3y<48,4y>48
12<y<16.....故 y=13,14,15
又 x=y-5
故 x=10 .y=15
5把一些书分给几个学生,如果每人分3本,那么余8本;如果前面的每个学生分5本,那么最后一人就分不到3本. 请问这些书有多少本?学生有多少人
设有学生X人
3X+8≤[X-1]×5+2 X≥5.5 即共有学生6人,本子有:3×6+8=26
6.幼儿园几个小孩分一箱苹果,如果每人分3个,那么余7个;如果每人分5个,那么有1人分得得苹果不足5个,问有多少小孩?多少苹果
设有X个小孩,有(3X+7)个苹果.
5(x-1)≤3x+7<5x
解得:3.5≤X≤5.5
则X=4或X=5
当X=4,3X+7=19;
当X=5, 3X+7=22;
有4个小孩,19个苹果;或有5个小孩,22个苹果.
7小放家每月水费不少于15元,自来水公司规定:若每户每月用水不超过5立方米,则每立方米收1、8元,若每户每月用水超过5立方米,则超出部分每立方米2元,小放家用水至少是多少
设至少是x立方米
1.2×5+2(x-5)≥156+2x-10≥15x≥9.5 至少是9.5立方米
8用每分时间可抽1.1吨水的A型抽水机来抽池水,半小时可以抽完,如果用B型抽水机,估计20分至22分可以抽完.B型抽水机比A型抽水机每分钟约多抽多少吨水?
设B型比A型每分约多抽x吨水.
20(1.1+x)<30*1.1 ⑴
22(1.1+x)>30*1.1 ⑵
由⑴得:x<0.55
由⑵得:x>0.4
∴不等式组的解集为0.55>x>0.4
9.七年级有学生530名,其中有1/9的男生和20名女生报名参加体育比,其余的学生中男、女生人数相等,七年级男、女生个多少名?
设有男生x名,女生有y名
则 x+y=530
x-x/9=y-20
解得 x=270
y=260
10用若干辆重量为8吨的汽车运一批货物,若每辆车之装4吨,则剩下20吨货物;若没亮着装满8吨,则最后一辆车不满也不空,问:有多少辆车?
设总共x辆车,则总共有货4x+20吨
8x>4x+20
x>5
4x+20>8(x-1)
x<7
5<x<7。而x又是整数,所以x=6
11初二年级秋游,若租用48座客车若干辆,则正好坐满;若租用64座客车,则能少租一辆,且有一辆车每有座满,但超过一半.一直租用48座客车每辆250元,租用64座客车每辆300元,问应租用哪种客车较合算?
设租用64座客车X辆,租用48座客车(X+1)辆
64X-48(X+1)>64÷2
64X-48(X+1)<6
解得5<X<7
租用64座客车6辆300×6=1800元250×7=1750元应租用48座客车客车较合算
12 将若干只鸡放入若干个笼,若每个笼里放4只,则有一只鸡无笼可放;若每个笼里放5只,则有一笼无鸡可放,那么至少有几只鸡几个笼?
有X个笼。
4X+1=5(x-1)
4x+1=5x-5
4x-5x=-5-1
x=6
∴4X+1=4x6+1=25
13甲、乙两车间各有若干个工人生产同一种零件,甲车间有1个人每天生产6件,其余每人每天生产11件;乙车间有1人每天生产7件,其余每人每天生产10件.已知两车间每天生产零件的总数相等,且每个车间每天生产零件总数不少于100件也不超过200件,则甲车间有多少人,乙车间有多少人?
设甲车间人数为x
那么甲车间每天生产的零件:6+11(x-1)=11x-5
乙车间的人数:(11x-5-7)/10+1=1.1x-0.2
100≤11x-5≤200
95/11≤x≤195/11
x为整数
9≤x≤17
1.1x-0.2为整数,
∴x=12
一方有难,八方支援”.在抗击“5.12”汶川特大地震灾害中,某市组织20辆汽车装运食品、药品、生活用品三种救灾物资共100吨到灾民安置点.按计划20辆汽车都要装运,每辆汽车只能装运同一种救灾物资且必须装满.根据下表提供的信息,解答下列问题:
(1)设装运食品的车辆数为 ,装运药品的车辆数为 .求 与 的函数关系式;
(2)如果装运食品的车辆数不少于5辆,装运药品的车辆数不少于4辆, 那么车辆的安排有几种方案?并写出每种安排方案;
(3)在(2)的条件下,若要求总运费最少,应采用哪种安排方案?并求出最少总运费 .
物资种类 食品 药品 生活用品
每辆汽车运载量(吨) 6 5 4
每吨所需运费(元/吨) 120 160 100
绛旓細3銆涓娆鑰冭瘯鍏辨湁25閬撻夋嫨棰橈紝鍋氬涓棰樺緱4鍒嗭紝鍋氶敊涓棰樺噺2鍒嗭紝涓嶅仛寰0鍒嗭紝鑻ュ皬鏄庢兂纭繚鑰冭瘯鎴愮哗鍦60鍒嗕互涓婏紝閭d箞锛屼粬鑷冲皯鍋氬X棰橈紝搴旀弧瓒崇殑涓嶇瓑寮鏄粈涔堬紵璁句綔瀵箈棰,閭d箞鍋氶敊鎴栬呬笉鍋氫簡25-x棰 4x -(25-x) =80 x=21 4銆佹煇瀹鹃涓妤煎鎴挎瘮浜屾ゼ灏5闂达紝鏌愭梾娓稿洟鏈48浜猴紝鑻ュ叏閮ㄥ畨鎺掑湪涓妤...
绛旓細) 66x+17y=3967 25x+y=1200 绛旀锛歺=48 y=47 (2) 18x+23y=2303 74x-y=1998 绛旀锛歺=27 y=79 (3) 44x+90y=7796 44x+y=3476 绛旀锛歺=79 y=48 (4) 76x-66y=4082 30x-y=2940 绛旀锛歺=98 y=51 (5) 67x+54y=8546 71x-y=568...
绛旓細鈶4x-6y=9 鈶6y-20z=2 鈶4x+6y+20z=113 瑙鏂圭▼缁勭洿鎺ュ緱瑙 瑙o細璁捐涓夌瓑濂栧崟浠穉鍏冿紝浜岀瓑濂栧崟浠2a鍏冿紝涓绛夊鍗曚环4a鍏 90鈮+2a+4a鈮150 瑙涓嶇瓑寮缁勫緱瑙
绛旓細6. 鍔犲伐闂锛氳鍒跺ザ鐗囩殑澶╂暟涓簒锛屽埗閰稿ザ鐨勫ぉ鏁颁负y锛屾牴鎹鎰忓彲鍒楀嚭涓嶇瓑寮缁勶細\[ \begin{cases} x + y \leq 4 \\ 10x + 30y \geq 100 \end{cases} \]瑙e緱x=2锛寉=2銆7. 浣忓闂锛氳涓変汉鏅氶棿涓簒闂达紝鍙屼汉鏅氶棿涓簓闂达紝鏍规嵁棰樻剰鍙垪鍑鏂圭▼锛歕[ 150x + 140y = 1510 \]瑙e緱...
绛旓細1.1锛墆-x=5, 鍒9m=-(y-x)=-5, m=-5/9.2) x+2y=3m, 2x-2y=18m, 3x=21m, 瑙e緱x=7m, y=-2m, 浠e叆鏂圭▼寰3*7m+2*(-2m)=17, 21m-4m=17m=17, m=1 2.1) 9涓囧厓璐疆50鍙帮紝鍒欏钩鍧囦竴鍙颁环鏍间负1800鍏冿紝杩欎釜浠锋牸鍦1500鍏冧互涓婏紝灏忎簬2100鍏冨拰2500鍏冿紝鍥犳鑲畾璐繘浜嗙敳锛岃涓簒...
绛旓細鈶唬鍏モ憽寰 3锛坹+3)-8y=4 y=1 鎵浠=4 鍒欙細杩欎釜浜屽厓涓娆℃柟绋缁勭殑瑙 {x=4 {y=1 2.{13x+14y=41 (1){14x+13y=40 (2)(2)-(1)寰 x-y=-1 鍗硏=y-1 (3)鎶(3)浠e叆(1)寰 13(y-1)+14y=41 鎵浠13y-13+14y=41 27y=54 y=2 鎶妝=2浠e叆(3)寰 鍗硏=1 鎵浠:x=1...
绛旓細瑙o細锛1锛夎浠栧杩欐湀浣跨敤宄般佽胺鐢靛垎鍒负x锛寉鍗冪摝鏃讹紝閭d箞锛屽彲鍒鏂圭▼缁勶細0.56x+0.28y=95.2;0.53(x+y)=95.2+10.8 瑙f柟绋嬬粍鍙緱锛歺=140,y=60 (2)璁剧敤宄般佽胺鐢靛垎鍒玿,y鍗冪摝鏃讹紝瑕佷娇鈥滃嘲璋风數鈥濆悎绠楋紝鍒欎竴搴旇鏈夛細0.56x+0.28y<0.53(x+y),鍗3x<25y 姝ゆ椂锛屽嘲鐢典笉瓒呰繃鎬荤數閲忕殑...
绛旓細浜屽厓涓娆℃柟绋缁搴旂敤棰 1. 涓娆$銆佹帓鐞冩瘮璧,鍏辨湁48涓槦,520鍚嶈繍鍔ㄥ憳鍙傚姞,鍏朵腑绡悆闃熸瘡闃10鍚,鎺掔悆闃熸瘡闃12鍚,姹傜銆佹帓鐞冨悇鏈夊灏戦槦鍙傝禌?2. 鏌愬巶涔拌繘鐢层佷箼涓ょ鏉愭枡鍏56鍚,鐢ㄥ幓9860鍏冦傝嫢鐢茬鏉愭枡姣忓惃190鍏,涔欑鏉愭枡姣忓惃160鍏,鍒欎袱绉嶆潗鏂欏悇涔板灏戝惃?3. 鏌愪汉鐢24000鍏冧拱杩涚敳銆佷箼涓ょ鑲$エ,鍦ㄧ敳鑲$エ鍗囧...
绛旓細鎬ラ渶浜屽厓涓娆℃柟绋缁,涓嶇瓑寮忕粍,搴旂敤棰鍚40閬,搴旂敤棰樺唴瀹瑰彲浠ユ槸浜屽厓涓娆℃柟绋嬬粍鎴栦笉绛夊紡缁,瑕侀鐩拰绛旀!... 鎬ラ渶浜屽厓涓娆℃柟绋嬬粍,涓嶇瓑寮忕粍,搴旂敤棰樺悇40閬,搴旂敤棰樺唴瀹瑰彲浠ユ槸浜屽厓涓娆℃柟绋嬬粍鎴栦笉绛夊紡缁,瑕侀鐩拰绛旀! 灞曞紑 1涓洖绛 #鐑# 宸插濂虫у氨搴旇鎵挎媴瀹堕噷澶ч儴鍒嗗鍔″悧?
绛旓細2x+5y=31 x=3 y=5 2.璁捐喘涔版煇绉嶉挗绗攛浠讹紝鍒欒喘涔扮瑪璁版湰锛40-x锛変欢锛屽緱锛3x+5*(48-x)鈮200 瑙e緱锛歺鈮20 鎵浠ワ紙48-x锛夆墹28 鍥犱负绗旇鏈暟涓嶅皯浜庨挗绗旀暟 鎵浠=20,21,22,23鎴24 鍗虫湁5绉嶆柟妗堝垎鍒槸 绗竴绉嶈喘涔版煇绉嶉挗绗20浠讹紝璐拱绗旇鏈28浠躲傜浜岀璐拱鏌愮閽㈢瑪21浠讹紝璐拱绗旇鏈27浠躲傜...