请亲们帮帮忙、一道七年级下册的数学计算题
\u4e03\u5e74\u7ea7\u4e0b\u518c\u6570\u5b66\u8ba1\u7b97\u9898\uff081\uff097(2x-1)-3(4x-1)=4(3x+2)-1; \uff082\uff09 (5y+1)+ (1-y)= (9y+1)+ (1-3y); \uff083\uff09[ (1/4x-3)-4 ]=x+2; \uff084\uff0920%+(1-20%)(320-x)=320\u00d740% \uff085\uff092(x-2)+2=x+1 \uff086\uff092(x-2)-3(4x-1)=9(1-x) \uff087\uff0911x+64-2x=100-9x \uff088\uff0915-(8-5x)=7x+(4-3x) \uff089\uff093(x-7)-2[9-4(2-x)]=22 \uff0810\uff093/2[2/3(1/4x-1)-2]-x=2 \uff0811\uff092x-10.3x=15 \uff0812\uff090.52x-(1-0.52)x=80 \uff0813\uff09x/2+3x/2=7 \uff0814\uff093x+7=32-2x \uff0815\uff093x+5(138-x)=540 \uff0816\uff093x-7(x-1)=3-2(x+3) \uff0817\uff09 18x+3x-3=18-2(2x-1) \uff0818\uff093(20-y)=6y-4(y-11) \uff0819\uff09-(x/4-1)=5 \uff0820\uff093[4(5y-1)-8]=6 \uff0821\uff09
; \uff0822\uff09(x\uff0b1)\uff0d3(x\uff0d1)=1\uff0d3x;\uff0823\uff09(x\uff0d2)\uff0d2(4x\uff0d1)=3(1\uff0dx).\uff0824\uff09 \uff0825\uff09 \uff1b\uff0826\uff09 \uff1b\uff0827\uff09 \uff1b \uff0828\uff09 \uff1b1\uff0e12\uff082x\uff0d3\uff09=4x+4 2. (2x+14)=4-15x 3. = 4. + =3+2y
5. 1 6. \uff0d 1 7. 6.5\uff1d 7.5
1. 2. 3.
4. 5. 6.
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2.\u67d0\u5927\u5546\u573a\u5bb6\u7535\u90e8\u9001\u8d27\u4eba\u5458\u4e0e\u9500\u552e\u4eba\u5458\u4eba\u6570\u4e4b\u6bd4\u4e3a1\uff1a8\u3002\u4eca\u5e74\u590f\u5929\u7531\u4e8e\u5bb6\u7535\u8d2d\u4e70\u91cf\u660e\u663e\u589e\u591a\uff0c\u5bb6\u7535\u90e8\u7ecf\u7406\u4ece\u9500\u552e\u4eba\u5458\u4e2d\u62bd\u8c03\u4e8622\u4eba\u53bb\u9001\u8d27\u3002\u7ed3\u679c\u9001\u8d27\u4eba\u5458\u4e0e\u9500\u552e\u4eba\u6570\u4e4b\u6bd4\u4e3a2\uff1a5\u3002\u6c42\u8fd9\u4e2a\u5546\u573a\u5bb6\u7535\u90e8\u539f\u6765\u5404\u6709\u591a\u5c11\u540d\u9001\u8d27\u4eba\u5458\u548c\u9500\u552e\u4eba\u5458\uff1f
3.\u73b0\u5bf9\u67d0\u5546\u54c1\u964d\u4ef710%\u4fc3\u9500,\u4e3a\u4e86\u4f7f\u9500\u552e\u91d1\u989d\u4e0d\u53d8,\u9500\u552e\u91cf\u8981\u6bd4\u6309\u539f\u4ef7\u9500\u552e\u65f6\u589e\u52a0\u767e\u5206\u4e4b\u51e0?
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\u4e8c\u8f66\u7684\u901f\u5ea6\u548c\u662f\uff1a[180*2]/12=30\u7c73/\u79d2
8.\u4e24\u6839\u540c\u6837\u957f\u7684\u8721\u70db,\u7c97\u7684\u53ef\u71c33\u5c0f\u65f6,\u7ec6\u7684\u53ef\u71c38/3\u5c0f\u65f6,\u505c\u7535\u65f6,\u540c\u65f6\u70b9\u71c3\u4e24\u6839\u8721\u70db,\u6765\u7535\u65f6\u540c\u65f6\u5439\u706d,\u7c97\u7684\u662f\u7ec6\u7684\u957f\u5ea6\u76842\u500d,\u6c42\u505c\u7535\u7684\u65f6\u95f4.
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9.\u67d0\u5de5\u5382\u4eca\u5e74\u5171\u751f\u4ea7\u67d0\u79cd\u673a\u56682300\u53f0\uff0c\u4e0e\u53bb\u5e74\u76f8\u6bd4\uff0c\u4e0a\u534a\u5e74\u589e\u52a025%\uff0c\u4e0b\u534a\u5e74\u51cf\u5c1115%\uff0c\u95ee\u4eca\u5e74\u4e0b\u534a\u5e74\u751f\u4ea7\u4e86\u591a\u5c11\u53f0?
10.\u7532\u9a91\u81ea\u884c\u8f66\u4eceA\u5730\u5230B\u5730\uff0c\u4e59\u9a91\u81ea\u884c\u8f66\u4eceB\u5730\u5230A\u5730\uff0c\u4e24\u4eba\u90fd\u5747\u901f\u524d\u8fdb\uff0c\u4ee5\u77e5\u4e24\u4eba\u5728\u4e0a\u53488\u65f6\u540c\u65f6\u51fa\u53d1\uff0c\u5230\u4e0a\u534810\u65f6\uff0c\u4e24\u4eba\u8fd8\u76f8\u8ddd36\u5343\u7c73\uff0c\u5230\u4e2d\u534812\u65f6\uff0c\u4e24\u4eba\u53c8\u76f8\u8ddd36\u5343\u7c73\uff0c\u6c42A\uff0eB\u4e24\u5730\u95f4\u7684\u8def\u7a0b\uff1f]
11.\u8dd1\u5f97\u5feb\u7684\u9a6c\u6bcf\u5929\u8d70240\u91cc\uff0c\u8dd1\u5f97\u6162\u7684\u9a6c\u6bcf\u5929\u8d70150\u91cc\u3002\u6162\u9a6c\u5148\u8d7012\u5929\uff0c\u5feb\u9a6c\u51e0\u5929\u53ef\u4ee5\u8ffd\u4e0a\u6162\u9a6c\uff1f
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14.\u8981\u52a0\u5de5200\u4e2a\u96f6\u4ef6\u3002\u7532\u5148\u5355\u72ec\u52a0\u5de5\u4e865\u5c0f\u65f6\uff0c\u7136\u540e\u53c8\u4e0e\u4e59\u4e00\u8d77\u52a0\u5de5\u4e864\u5c0f\u65f6\uff0c\u5b8c\u6210\u4e86\u4efb\u52a1\u3002\u5df2\u77e5\u7532\u6bcf\u5c0f\u65f6\u6bd4\u4e59\u591a\u52a0\u5de52\u4e2a\u96f6\u4ef6\uff0c\u6c42\u7532\u3001\u4e59\u6bcf\u5c0f\u65f6\u5404\u52a0\u5de5\u591a\u5c11\u4e2a\u96f6\u4ef6\uff1f
15.\u4e00\u5927\u6865\u603b\u957f1000\u7c73,\u4e00\u5217\u706b\u8f66\u4ece\u6865\u4e0a\u901a\u8fc7,\u6d4b\u5f97\u706b\u8f66\u4ece\u5f00\u59cb\u4e0a\u6865\u5230\u5b8c\u5168\u8fc7\u6865\u5171\u75281\u5206\u949f,\u6574\u5217\u706b\u8f66\u5b8c\u5168\u5728\u6865\u4e0a\u65f6\u95f4\u4e3a40\u79d2,\u6c42\u706b\u8f66\u901f\u5ea6\u548c\u957f\u5ea6.
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20.\u5546\u5e97\u51fa\u552e\u4e24\u5957\u8863\u670d\uff0c\u6bcf\u5957\u552e\u4ef7135\u5143\uff0c\u6309\u6210\u672c\u7b97\uff0c\u5176\u4e2d\u4e00\u5957\u76c8\u522925\uff05\uff0c\u4e00\u5957\u4e8f25\uff05\uff0c\u4e24\u5957\u5408\u8ba1\u76c8\u8fd8\u662f\u4e8f
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21.\u4e00\u79cd\u996e\u7528\u6c34\u7684\u5706\u67f1\u5f62\u6c34\u6876\u7684\u5185\u76f4\u5f84\u4e3a25\u5398\u7c73\uff0c\u5185\u58c1\u9ad8\u4e3a35\u5398\u7c73\uff0c\u6709\u4e00\u79cd\u5185\u5f84\u4e3a6\u5398\u7c73\uff0c\u5185\u58c1\u9ad8\u4e3a10\u5398\u7c73\u7684\u73bb\u7483\u676f\uff0c\u82e5\u628a\u4e00\u6876\u996e\u7528\u6c34\u5206\u76db\u4e8e\u8fd9\u79cd\u73bb\u7483\u676f\uff0c\u9700\u8981\u51e0\u4e2a\u73bb\u7483\u676f\uff1f
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22.\u8bf7\u4e24\u540d\u5de5\u4eba\u5236\u4f5c\u5e7f\u544a\u724c\uff0c\u4e00\u53ea\u5e08\u5085\u5355\u72ec\u505a\u97004\u5929\u5b8c\u6210\uff0c\u5f92\u5f1f\u5355\u72ec\u505a\u97006\u5929\u5b8c\u6210\uff0c\u73b0\u5728\u5f92\u5f1f\u5148\u505a1\u5929\uff0c\u518d\u4e24\u4eba\u5408\u4f5c\uff0c\u5b8c\u6210\u540e\u5171\u7684\u62a5\u916c450\u5143\uff0c\u5982\u679c\u6309\u5404\u4eba\u5b8c\u6210\u5de5\u4f5c\u91cf\u8ba1\u7b97\u62a5\u916c\uff0c\u90a3\u4e48\u8be5\u5982\u4f55\u5206\u914d\uff1f
23.\u67d0\u98df\u5802\u7b2c\u4e8c\u5b63\u5ea6\u4e00\u5171\u8282\u7ea6\u71643700kg\uff0c\u5176\u4e2d\u4e94\u6708\u4efd\u6bd4\u56db\u6708\u4efd\u591a\u8282\u7ea620%\uff0c\u516d\u6708\u4efd\u6bd4\u4e94\u6708\u4efd\u591a\u8282\u7ea625%\uff0c\u8be5\u98df\u5802\u516d\u6708\u4efd\u8282\u7ea6\u7164\u591a\u5c11\u5343\u514b\uff1f
24.\u7236\u5b50\u4e8c\u4eba\u5728\u540c\u4e00\u5de5\u5382\u5de5\u4f5c\uff0c\u7236\u4eb2\u4ece\u5bb6\u8d70\u5230\u5de5\u5382\u8981\u752830\u5206\u949f\uff0c\u513f\u5b50\u8d70\u8fd9\u6bb5\u8def\u53ea\u970020\u5206\u949f\uff0c\u7236\u4eb2\u6bd4\u513f\u5b50\u65e95\u5206\u949f\u52a8\u8eab\uff0c\u95ee\u8fc7\u591a\u5c11\u5206\u949f\u800c\u5b57\u80fd\u8ffd\u4e0a\u7236\u4eb2\uff1f
\u7236\u5b50\u4e8c\u4eba\u5728\u540c\u4e00\u5de5\u5382\u5de5\u4f5c\uff0c\u7236\u4eb2\u4ece\u5bb6\u8d70\u5230\u5de5\u5382\u8981\u752830\u5206\u949f\uff0c\u513f\u5b50\u8d70\u8fd9\u6bb5\u8def\u53ea\u970020\u5206\u949f\uff0c\u7236\u4eb2\u6bd4\u513f\u5b50\u65e95\u5206\u949f\u52a8\u8eab\uff0c\u95ee\u8fc7\u591a\u5c11\u5206\u949f\u800c\u5b57\u80fd\u8ffd\u4e0a\u7236\u4eb2\uff1f
25.\u4e00\u652f\u961f\u4f0d\u957f450m,\u4ee590/\u5206\u7684\u901f\u5ea6\u524d\u8fdb\uff0c\u4e00\u4eba\u4ece\u6392\u5934\u5230\u6392\u5c3e\u53d6\u4e1c\u897f\uff0c\u7acb\u5373\u8fd4\u56de\uff0c\u4ed6\u7684\u901f\u5ea6\u662f\u961f\u4f0d\u76842\u500d\uff0c\u6b64\u4eba\u5f80\u8fd4\u5171\u7528\u591a\u957f\u65f6\u95f4\uff1f
90/\u5206 \u662f\u6bcf\u5206\u949f90\u7c73\u5417\uff1f\u4e0b\u9762\u5c31\u662f\u4ee590\u7c73\u6bcf\u5206\u7684\u901f\u5ea6\u8ba1\u7b97\u7684 90\u7c73/\u5206=1.5\u7c73/\u79d2
\u4ece\u6392\u5934\u5230\u6392\u5c3e\u7684\u65f6\u95f4\u4e3at\uff0c
26.\u4e0a\u5468\uff0c\u5988\u5988\u5728\u8d85\u5e02\u752836\u5143\u4e70\u4e86\u82e5\u5e72\u76d2\u725b\u5976\u3002\u4eca\u5929\uff0c\u5979\u53c8\u6765\u5230\u8fd9\u5bb6\u8d85\u5e02\uff0c\u53d1\u73b0\u4e0a\u6b21\u4e70\u7684\u725b\u5976\u6bcf\u76d2\u8ba9\u52290.3\u5143\u9500\u552e\u3002\u4e8e\u662f\u5988\u5988\u4fbf\u53c8\u82b1\u4e8636\u5143\u4e70\u4e86\u8fd9\u79cd\u725b\u5976\uff0c\u7ed3\u679c\u53d1\u73b0\u6bd4\u539f\u6765\u591a\u4e704\u76d2\u3002\u539f\u6765\u8fd9\u79cd\u725b\u5976\u7684\u9500\u552e\u4ef7\u662f\u591a\u5c11\u5143\uff1f
27.\u7532,\u4e59\u4e24\u4eba\u5728\u4e00\u6761\u957f400\u7c73\u7684\u73af\u5f62\u8dd1\u9053\u4e0a\u8dd1\u6b65,\u7532\u7684\u901f\u5ea6\u662f360\u7c73/\u5206,\u4e59\u7684\u901f\u5ea6\u662f240\u7c73/\u5206.
(1)\u4e24\u4eba\u540c\u65f6\u540c\u5730\u540c\u5411\u8dd1,\u95ee\u7b2c\u4e00\u6b21\u76f8\u9047\u65f6,\u4e24\u4eba\u4e00\u5171\u8dd1\u4e86\u51e0\u5708?
(2)\u4e24\u4eba\u540c\u65f6\u540c\u5730\u540c\u5411\u8dd1,\u95ee\u51e0\u79d2\u540e\u4e24\u4eba\u7b2c\u4e00\u6b21\u76f8\u9047\u65f6?
2\u3001
\u5e94\u8be5\u662f\uff1a\u201c\u4e24\u4eba\u540c\u65f6\u540c\u5730\u53cd\u5411\u8dd1\u201d\u5427
28.\u7532\u3001\u4e59\u4e24\u5217\u706b\u8f66\u76f8\u5411\u800c\u884c\uff0c\u7532\u5217\u8f66\u6bcf\u5c0f\u65f6\u884c\u9a7660\u5343\u7c73\uff0c\u8f66\u957f150\u7c73\uff1b\u4e59\u5217\u8f66\u6bcf\u5c0f\u65f6\u884c\u9a7675\u5343\u7c73\uff0c\u8f66\u957f120\u7c73\u3002\u4e24\u8f66\u4ece\u8f66\u5934\u76f8\u9047\u5230\u8f66\u5c3e\u76f8\u79bb\u9700\u591a\u5c11\u65f6\u95f4\uff1f
29.\u9ad8\u901f\u516c\u8def\u4e0a\uff0c\u4e00\u4e24\u957f4\u7c73\u901f\u5ea6\u4e3a110\u5343\u7c73/\u5c0f\u65f6\u7684\u8f7f\u8f66\u51c6\u5907\u8d85\u8d8a\u4e00\u8f8612\u7c73\uff0c\u901f\u5ea6\u4e3a100\u5343\u7c73/\u5c0f\u65f6\u7684\u5361\u8f66\uff0c\u5219\u8f7f\u8f66\u4ece\u5f00\u59cb\u8ffd\u60bc\u5361\u8f66\uff0c\u9700\u8981\u82b1\u8d39\u7684\u65f6\u95f4\u662f\u591a\u5c11\u79d2\uff1f\uff08\u7cbe\u786e\u52301\u79d2\uff09
30.\u6c7d\u8f66\u4ee5\u6bcf\u5c0f\u65f672\u5343\u7c73\u7684\u901f\u5ea6\u5728\u516c\u8def\u4e0a\u884c\u9a76\uff0c\u5f00\u5411\u5bc2\u9759\u7684\u5c71\u8c37\uff0c\u9a7e\u9a76\u5458\u6309\u4e00\u58f0\u5587\u53ed\uff0c4\u79d2\u949f\u540e\u542c\u5230\u56de\u58f0\uff0c\u8fd9\u65f6\u6c7d\u8f66\u79bb\u5c71\u8c37\u591a\u8fdc\uff1f\uff08\u58f0\u97f3\u7684\u4f20\u64ad\u901f\u5ea6\u4e3a\u6bcf\u79d2340\u7c73)
31.\u4e00\u6b21\u6570\u5b66\u6d4b\u9a8c,\u8bd5\u5377\u753125\u9053\u9009\u62e9\u9898\u7ec4\u6210,\u8bc4\u5206\u6807\u51c6\u89c4\u5b9a:\u9009\u5bf9\u4e00\u9053\u5f974\u5206,\u4e0d\u9009\u6216\u9519\u9009\u6263\u4e00\u9053\u4e00\u5206,\u5c0f\u84dd\u6700\u540e\u5f97\u4e8685\u5206,\u95ee\u4ed6\u7b54\u5bf9\u4e86\u591a\u5c11\u5230\u9898?
32.\u5728\u4e00\u4e2a\u5e95\u9762\u76f4\u5f845cm\u3001\u9ad818cm\u7684\u5706\u67f1\u5f62\u74f6\u5185\u88c5\u6ee1\u6c34\u3002\u518d\u5c06\u74f6\u5185\u7684\u6c34\u5012\u5165\u4e00\u4e2a\u5e95\u9762\u76f4\u5f846cm\u3001\u9ad810cm\u7684\u5706\u67f1\u5f62\u73bb\u7483\u74f6\u5185\u88c5\u6ee1\u6c34\uff0c\u80fd\u5426\u5b8c\u5168\u88c5\u4e0b\uff1f\u82e5\u88c5\u4e0d\u4e0b\uff0c\u90a3\u4e48\u74f6\u5185\u6c34\u9762\u8fd8\u6709\u591a\u9ad8\uff1f\u82e5\u672a\u80fd\u88c5\u6ee1\uff0c\u6c42\u676f\u5185\u6c34\u9762\u79bb\u676f\u53e3\u7684\u8ddd\u79bb\u3002
33.\u67d0\u73ed\u670945\u4eba,\u4f1a\u4e0b\u8c61\u68cb\u7684\u4eba\u6570\u662f\u4f1a\u4e0b\u56f4\u68cb\u76843.5\u500d,2\u79cd\u90fd\u4f1a\u6216\u90fd\u4e0d\u4f1a\u7684\u90fd\u662f5\u4eba,\u6c42\u53ea\u4f1a\u4e0b\u56f4\u68cb\u7684\u4eba\u6570\u3002
34.\u4e00\u4efd\u8bd5\u5377\u5171\u670925\u9053\u9898\uff0c\u6bcf\u9053\u9898\u90fd\u7ed9\u51fa\u4e864\u4e2a\u7b54\u6848\uff0c\u6bcf\u9053\u9898\u9009\u5bf9\u5f974\u5206\uff0c\u4e0d\u9009\u6216\u9009\u9519\u62631\u5206\uff0c\u7532\u540c\u5b66\u8bf4\u4ed6\u5f97\u4e8671\u5206\uff0c\u4e59\u540c\u5b66\u8bf4\u4ed6\u5f97\u4e8662\u5206\uff0c\u4e19\u540c\u5b66\u8bf4\u4ed6\u5f97\u4e8695\u5206\uff0c\u4f60\u8ba4\u4e3a\u54ea\u4e2a\u540c\u5b66\u8bf4\u5f97\u5bf9\uff1f\u8bf7\u8bf4\u660e\u7406\u7531\u3002
\u4e19\u540c\u5b66\u8bf4\u5f97\u5bf9\uff0c\u7406\u7531\u5982\u4e0b\uff1a
35.\u67d0\u6c34\u679c\u6279\u53d1\u5e02\u573a\u9999\u8549\u7684\u4ef7\u683c\u5982\u4e0b
\u8d2d\u4e70\u9999\u8549\u6570 \u4e0d\u8d85\u8fc720kg 20kg\u4ee5\u4e0a\u4f46\u4e0d\u8d85\u8fc740kg 40kg\u4ee5\u4e0a
\u6bcf\u5343\u514b\u4ef7\u683c 6RMB 5RMB 4RMB
\u5f20\u5f3a\u4e24\u6b21\u8d2d\u4e70\u9999\u854950kg\uff08\u7b2c\u4e8c\u6b21\u591a\u4e8e\u7b2c\u4e00\u6b21\uff09\uff0c\u5171\u4ed8\u51fa264\u5143\uff0c\u8bf7\u95ee\u5f20\u5f3a\u7b2c\u4e00\u6b21\uff0c\u7b2c\u4e8c\u6b21\u5206\u522b\u4e70\u9999\u8549\u591a\u5c11\u5343\u514b\uff1f
\u3002
\u4e00\u5217\u706b\u8f66\u901a\u8fc7\u4e00\u5ea7\u957f300\u7c73\u7684\u94c1\u6865\uff0c\u5b8c\u5168\u901a\u8fc7\u6240\u7528\u7684\u65f6\u95f4\u4e3a30\u79d2\uff0c\u5b8c\u5168\u5728\u6865\u4e0a\u7684\u65f6\u95f4\u4e3a10\u79d2\uff0c\u90b1\u706b\u8f66\u7684\u8f66\u957f\u4ee5\u53ca\u5b83\u7684\u901f\u5ea6\u3002
\u89e3\uff1a
l+300=30v
300-l=10v
v=15m/s
l=150m
\u7b54\uff1a\u8f66\u957f150m,\u901f\u5ea615m/s\u3002
2\u3001\u67d0\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\uff0c\u4e59\u7ec4\u6b65\u884c\u3002\u8f66\u884c\u81f3A\u5904\uff0c\u7532\u7ec4\u4e0b\u8f66\u6b65\u884c\uff0c\u8f66\u8fd4\u56de\u63a5\u4e59\u7ec4\uff0c\u6700\u540e\u4e24\u7ec4\u540c\u65f6\u5230\u8fbe\u5317\u5c71\u3002\u5df2\u77e5\u6c7d\u8f66\u901f\u5ea6\u662f60km/h,\u6b65\u884c\u901f\u5ea6\u662f4km/h.\u6c42A\u70b9\u8ddd\u5317\u5c71\u7684\u8ddd\u79bb\u3002
\u8bbe\u7532\u7684\u901f\u5ea6\u4e3ax\uff0c\u4e59\u7684\u901f\u5ea6\u4e3ay
80x+80y=400
80y-80x=400
\u6240\u4ee5x=0 y=5\uff08\u8fd9\u9053\u9898\u65f6\u95f4\u4e3a80\u79d2\u4e0e\u5b9e\u9645\u4e0d\u7b26\uff09
3\u3001\u8bbeA\u70b9\u8ddd\u5317\u5c71\u7684\u8ddd\u79bb\u4e3ax\uff0c\u8f66\u8fd4\u56de\u5230\u4e59\u7ec4\u65f6\uff0c\u4e59\u8ddd\u51fa\u53d1\u70b9\u8ddd\u79bb\u4e3ay
\u90a3\u4e48[x-4*\uff0818-x-y)/60]/4=\uff0818-y\uff09/60
y/4=\uff0818-x\uff09/60+\uff0818-x-y\uff09/60
\u6240\u4ee5x=2 y=2
A\u70b9\u8ddd\u79bb\u5317\u5c71\u4e3a2km
3. \u7261\u4e39\u676f\u8db3\u7403\u8d5b11\u8f6e(\u5373\u6bcf\u4e2a\u961f\u5747\u9700\u6bd4\u8d5b11\u573a),\u80dc\u4e00\u573a\u5f973\u5206,\u5e73\u4e00\u573a\u5f97\u4e00\u5206,\u8d1f\u4e00\u573a\u5f970\u5206.\u56fd\u5174\u4e09\u9ad8\u4ff1\u4e50\u90e8\u961f\u6240\u80dc\u573a\u6570\u662f\u6240\u8d1f\u573a\u6570\u76844\u500d,\u7ed3\u679c\u5171\u5f9725\u5206,\u6b64\u6b21\u676f\u8d5b\u8be5\u7403\u961f\u80dc\\u8d1f\\u5e73\u5404\u51e0\u573a?
\u8bbe\u80dcx\u573a\uff0c\u8d1fy\u573a\uff0c\u5219\u5e7311-x-y\u573a
x=4y
3x+11-x-y=25
x=8
y=2
\u80dc8\u573a\uff0c\u8d1f2\u573a\uff0c\u5e731\u573a
4.\u8bfe\u5916\u6d3b\u52a8\u4e2d\u4e00\u4e9b\u540c\u5b66\u5206\u7ec4\u53c2\u52a0\u6d3b\u52a8,\u539f\u6765\u6bcf\u7ec48\u4eba\uff0c\u540e\u6765\u91cd\u65b0\u7f16\u7ec4,\u6bcf\u7ec412\u4eba,\u8fd9\u6837\u6bd4\u539f\u6765\u51cf\u5c11\u4e862\u7ec4,\u95ee\u8fd9\u4e9b\u540c\u5b66\u5171\u6709\u591a\u5c11\u4eba?
\u8bbe\u539f\u6765\u6709x\u7ec4\u3002\u6240\u4ee5\u4eba\u6570\u662f8x
(x-2)12=8x
x=6
\u5171\u670948\u4eba\u3002
5.\u5728\u5730\u8868\u4e0a\u65b910\u5343\u7c73\u9ad8\u7a7a\u6709\u4e00\u6761\u9ad8\u901f\u98ce\u5e26.\u5047\u8bbe\u6709\u4e24\u67b6\u901f\u5ea6\u76f8\u540c\u7684\u98de\u673a\u5728\u8fd9\u4e2a\u98ce\u5e26\u98de\u884c,\u5176\u4e2d\u4e00\u67b6\u98de\u673a\u4eceA\u5730\u98de\u5f80B\u5730,\u8ddd\u79bb\u662f4000\u7c73,\u9700\u89816.5\u65f6;\u540c\u65f6\u53e6\u4e00\u67b6\u98de\u673a\u4eceB\u5730\u98de\u5230A\u5730,\u53ea\u82b15.2\u65f6.\u95ee\u98de\u673a\u548c\u98ce\u7684\u5e73\u5747\u901f\u5ea6\u5404\u662f\u591a\u5c11?
\u8bbe\u98de\u673a\u7684\u5e73\u5747\u901f\u5ea6\u4e3axkm/h\uff0c\u98ce\u901f\u4e3aykm/h\u3002
\u7531\u9898\u610f\u53ef\u77e5\uff0c\u4eceA\u5730\u5230B\u5730\u9006\u98ce\uff0c\u4eceB\u5730\u5230A\u5730\u987a\u98ce\u3002\u53ef\u5217\u65b9\u7a0b\uff1a
x+y=4/5.2
x-y=4/6.5
\u89e3\u5f97:x=9/13,y=1/13
6.\u4e00\u652f\u961f\u4f0d\u4ee55\u5343\u7c73/\u5c0f\u65f6\u7684\u901f\u5ea6\u884c\u8fdb\uff0c20\u5206\u949f\u540e\uff0c\u4e00\u901a\u8baf\u5458\u6253\u7684\u4ee515\u5343\u7c73/\u5c0f\u65f6\u7684\u901f\u5ea6\u8ffd\u8d76\u961f\u4f0d\uff0c\u90a3\u4ed6\u591a\u5c11\u5c0f\u65f6\u540e\u8ffd\u4e0a\u961f\u4f0d\uff1f
5*(1/3)+5*X=15*X
x=1/6
6. \u4e00\u6536\u5272\u673a\u6bcf\u5929\u6536\u5272\u5c0f\u9ea612\u516c\u9877\uff0c\u5272\u5b8c\u9ea6\u5730\u76842/3\u540e\uff0c\u6548\u7387\u63d0\u9ad8\u5230\u539f\u6765\u76845/4\u500d\uff0c\u56e0\u6b64\u6bd4\u9884\u5b9a\u65f6\u95f4\u63d0\u65e91\u5929\u5b8c\u6210\uff0c\u95ee\u9ea6\u5730\u5171\u6709\u591a\u5c11\u516c\u9877\uff1f
\u8bbe\u9ea6\u5730\u6709x\u516c\u9877\uff0c\u56e0\u4e3a\u5df2\u5272\u5b8c\u4e862/3\uff0c\u6240\u4ee5\u8fd8\u52691/3\uff0c\u5f97\u65b9\u7a0b\uff1a
(1/3)x/12=(1/3)x/[12*(5/4)]+1
\u5316\u7b80\u5f97\uff1a
(5/3)x=(4/3)x+60
(1/3)x=60
x=180
\u6240\u4ee5\u9ea6\u5730\u6709180\u516c\u9877.
7.\u7532\u3001\u4e59\u4e24\u4eba\u63092\uff1a5\u7684\u6bd4\u4f8b\u6295\u8d44\u5f00\u529e\u4e86\u4e00\u5bb6\u516c\u53f8\uff0c\u7ea6\u5b9a\u51fa\u53bb\u5404\u9879\u652f\u51fa\u5916\uff0c\u6240\u5f97\u5229\u6da6\u6309\u6295\u8d44\u6bd4\u4f8b\u5206\u6210\uff0c\u82e5\u7b2c\u4e00\u5e74\u8d62\u522914000\u5143\uff0c\u90a3\u4e48\u7532\u3001\u4e59\u4e24\u4eba\u5206\u522b\u5e94\u5206\u5f97\u591a\u5c11\u5143\uff1f\u5217\u3010\u65b9\u7a0b\u7ec4\u3011\u89e3\u7b54
\u89e3\uff1a\u8bbe\u6bcf\u5206\u4e3aX
2X+5X=14000
7X=14000
X=2000
2X=4000
5X=10000
\u6240\u4ee5\u7532\u5206\u52304000\u5143\uff0c\u4e59\u5206\u523010000\u5143
8.\u6c11\u822a\u89c4\u5b9a:\u4e58\u5750\u98de\u673a\u666e\u901a\u8231\u65c5\u5ba2\u4e00\u4eba\u6700\u591a\u53ef\u514d\u8d39\u643a\u5e2620\u5343\u514b\u884c\u674e\uff0c\u8d85\u8fc7\u90e8\u5206\u6bcf\u5343\u514b\u6309\u98de\u673a\u7968\u4ef7\u768415%\u8d2d\u4e70\u884c\u674e\u7968.\u4e00\u540d\u65c5\u5ba2\u5e26\u4e8635\u5343\u514b\u884c\u674e\u4e58\u673a,\u673a\u7968\u8fde\u540c\u884c\u674e\u7968\u5171\u4ed81323\u5143,\u6c42\u8be5\u65c5\u5ba2\u7684\u673a\u7968\u7968\u4ef7.
\u8bf7\u5217\u65b9\u7a0b\u89e3\u5e94\u7528\u9898
\u8bbe\u7968\u4ef7\u4e3ax\u5143
x+(35-20)*1.5%x=1323 x=1080
(\u5e94\u8be5\u662f\u6bcf\u5343\u514b\u63091.5%\u6536\u8d39,\u4e0d\u662f15%) \u4e0d\u53ef\u80fd\u6536\u8d39\u8fd9\u6837\u9ad8,\u5982\u679c\u8fd9\u6837\u9ad8,\u8ba1\u7b97\u7ed3\u679c\u4e0d\u662f\u6574\u6570,\u4e0d\u7b26\u5408\u673a\u7968\u73b0\u5b9e\u4e2d\u7684\u6536\u8d39,\u5982\u679c\u630915%,\u7b54\u6848\u5c31\u662f\u4ed6\u4eec\u8bf4\u7684407,\u5982\u679c\u63091.5%,\u90a3\u7b54\u6848\u5c31\u662f\u6211\u8bf4\u76841080,\u662f\u4e2a\u6574\u6570,\u4e5f\u7b26\u5408\u73b0\u5b9e\u60c5\u51b5.
9.\u5546\u5e97\u5728\u9500\u552e\u4e8c\u79cd\u552e\u4ef7\u4e00\u6837\u7684\u5546\u54c1\u65f6\uff0c\u5176\u4e2d\u4e00\u4ef6\u76c8\u522925%\uff0c\u53e6\u4e00\u4ef6\u4e8f\u635f25%\uff0c\u5356\u8fd9\u4e24\u4ef6\u5546\u54c1\u603b\u7684\u662f\u76c8\u5229\u8fd8\u662f\u4e8f\u635f\uff1f
\u89e3\uff1a\u8bbe\u8fd9\u4e24\u4ef6\u5546\u54c1\u552e\u4ef7\u90fd\u4e3ax\u5143
\u56e0\u4e3a\u8fdb\u4ef7\u4e3a,x/(1+25%)+x/(1-25%)=4/5x+4/3x=32/15x
\u552e\u4ef7\u4e3a\uff0cx+x=2x
32/15x>2x \u5373\u8fdb\u4ef7>\u552e\u4ef7
\u6240\u4ee5\u4e8f\u635f
10.\u4e00\u5217\u706b\u8f66\u901a\u8fc7\u4e00\u5ea7\u957f300\u7c73\u7684\u94c1\u6865\uff0c\u5b8c\u5168\u901a\u8fc7\u6240\u7528\u7684\u65f6\u95f4\u4e3a30\u79d2\uff0c\u5b8c\u5168\u5728\u6865\u4e0a\u7684\u65f6\u95f4\u4e3a10\u79d2\uff0c\u90b1\u706b\u8f66\u7684\u8f66\u957f\u4ee5\u53ca\u5b83\u7684\u901f\u5ea6\u3002
\u89e3\uff1a
l+300=30v
300-l=10v
v=15m/s
l=150m
\u7b54\uff1a\u8f66\u957f150m,\u901f\u5ea615m/s\u3002
\u67d0\u8f66\u95f4\u6bcf\u5929\u80fd\u751f\u4ea7\u7532\u79cd\u96f6\u4ef6120\u4e2a\uff0c\u6216\u4e59\u79cd\u96f6\u4ef6100\u4e2a\uff0c\u6216\u4e19\u79cd\u96f6\u4ef6200\u4e2a\uff0c\u7532\uff0c\u4e59\uff0c\u4e19\u4e09\u79cd\u96f6\u4ef6\u5206\u522b\u53d63\u4e2a\uff0c2\u4e2a\uff0c1\u4e2a\u53ef\u914d\u6210\u4e00\u5957\u3002\u73b0\u8981\u6c42\u572830\u5929\u5185\u751f\u4ea7\u51fa\u6700\u591a\u7684\u6210\u5957\u4ea7\u54c1\uff0c\u7532\uff0c\u4e59\uff0c\u4e19\u4e09\u79cd\u96f6\u4ef6\u5e94\u8be5\u5404\u5b89\u6392\u751f\u4ea7\u591a\u5c11\u5929\uff1f
1.\u67d0\u5c0f\u7ec4\u8ba1\u5212\u505a\u4e00\u6279\u201c\u4e2d\u56fd\u7ed3\u201d\uff0c\u5982\u679c\u6bcf\u4eba\u505a5\u4e2a\uff0c\u90a3\u4e48\u6bd4\u8ba1\u5212\u591a\u4e869\u4e2a\uff1b\u5982\u679c\u6bcf\u4eba\u505a4\u4e2a\uff0c\u90a3\u4e48\u6bd4\u8ba1\u5212\u5c11\u4e8615\u4e2a\uff0c\u5c0f\u7ec4\u6210\u5458\u5171\u6709\u591a\u5c11\u540d\uff1f\u4ed6\u4eec\u8ba1\u5212\u505a\u591a\u5c11\u4e2a\u201c\u4e2d\u56fd\u7ed3\u201d\uff1f
\u8bbe\u5c0f\u7ec4\u6210\u5458\u6709x\u540d
5x=4x\uff0b15+9
5x-4x=15\uff0b9
2.
\u67d0\u4e2d\u5b66\u7ec4\u7ec7\u521d\u4e00\u5b66\u751f\u8fdb\u884c\u6625\u6e38\uff0c\u539f\u8ba1\u5212\u79df\u752845\u5ea7\u5ba2\u8f66\u82e5\u5e72\u8f86\uff0c\u4f46\u670915\u4eba\u6ca1\u6709\u5ea7\u4f4d\uff1b\u82e5\u79df\u7528\u540c\u6837\u6570\u91cf\u768460\u5ea7\u5ba2\u8f66\uff0c\u5219\u591a\u51fa\u4e00\u8f86\u8f66\uff0c\u4e14\u5176\u4f59\u5ba2\u8f66\u6070\u597d\u5750\u6ee1\u3002\u8bd5\u95ee
\uff081\uff09 \u521d\u4e00\u5e74\u7ea7\u4eba\u6570\u662f\u591a\u5c11\uff1f\u539f\u8ba1\u5212\u79df\u752845\u5ea7\u5ba2\u8f66\u591a\u5c11\u8f86\uff1f
\u89e3\uff1a\u79df\u752845\u5ea7\u5ba2\u8f66x\u8f86\uff0c\u79df\u752860\u5ea7\u5ba2\u8f66(x-1)\u8f86,
45x+15=60(x-1)
\u89e3\u4e4b\u5f97\uff1ax=5 45x+15=240(\u4eba\uff09
\u7b54\uff1a\u521d\u4e00\u5e74\u7ea7\u5b66\u751f\u4eba\u6570\u662f240\u4eba\uff0c
\u8ba1\u5212\u79df\u752845\u5ea7\u5ba2\u8f66\u4e3a5\u8f86
3.\u5c06\u4e00\u6279\u4f1a\u8ba1\u62a5\u8868\u8f93\u5165\u7535\u8111\uff0c\u7532\u5355\u72ec\u505a\u970020h\u5b8c\u6210\uff0c\u4e59\u5355\u72ec\u505a\u970012h\u5b8c\u6210\uff0e\u73b0\u5728\u5148\u7531\u7532\u5355\u72ec\u505a4h\uff0c\u5269\u4e0b\u7684\u90e8\u5206\u7531\u7532\uff0c\u4e59\u5408\u4f5c\u5b8c\u6210\uff0c\u7532\uff0c\u4e59\u4e24\u4eba\u5408\u4f5c\u7684\u65f6\u95f4\u662f\u591a\u5c11\uff1f
\u89e3;\u8bbe\u4e3aXH
1/5+1/20X+1/12X=1
8/60X=4/5
X=6
\u7532\uff0c\u4e59\u4e24\u4eba\u5408\u4f5c\u7684\u65f6\u95f4\u662f6H.
4.\u7532\u4e59\u4e19\u4e09\u4e2a\u6570\u7684\u548c\u662f53\uff0c\u4ee5\u77e5\u7532\u6570\u548c\u4e59\u6570\u7684\u6bd4\u662f4\uff1a3,\u4e19\u6570\u6bd4\u4e59\u6570\u5c112\uff0c\u4e59\u6570\u662f\uff08\uff09\uff0c\u4e19\u6570\u662f\uff08\uff09
\u8bbe\u7532\u6570\u4e3a4X.\u5219\u4e59\u4e3a3X.\u4e19\u4e3a3X-2.
4X+3X+3X-2=53
10X=53+2
10X=55
X=5.5
3X=16.5
3X-2=16.5-2=14.5
\u4e59\u4e3a16.5,\u4e19\u4e3a14.5
5.\u7c97\u8721\u70db\u548c\u7ec6\u8721\u70db\u7684\u957f\u77ed\u4e00\u6837\uff0c\u7c97\u8721\u70db\u53ef\u71c35\u5c0f\u65f6\uff0c\u7ec6\u8721\u70db\u53ef\u71c34\u5c0f\u65f6\uff0c\u4e00\u6b21\u505c\u7535\u540e\u540c\u65f6\u70b9\u71c3\u8fd9\u4e24\u53ea\u8721\u70db\uff0c\u6765\u7535\u540e\u540c\u65f6\u7184\u706d\uff0c\u7ed3\u679c\u53d1\u73b0\u7c97\u8721\u70db\u7684\u957f\u662f\u7ec6\u8721\u70db\u957f\u76844\u500d\uff0c\u6c42\u505c\u7535\u591a\u957f\u65f6\u95f4\uff1f
\u8bbe\u505c\u7535x\u5c0f\u65f6. \u7c97\u8721\u70db\u6bcf\u5c0f\u65f6\u71c3\u70e71/5,\u7ec6\u8721\u70db\u662f1/4
1-1/5X=4(1-1/4)
1-1/5X=4-X
-1/5+X=4-1
4/5X=3
X=15/4
6.\u4e00\u4e2a\u4e09\u4f4d\u6570,\u767e\u4f4d\u4e0a\u7684\u6570\u5b57\u6bd4\u5341\u4f4d\u4e0a\u7684\u6570\u5b57\u59271,\u4e2a\u4f4d\u4e0a\u7684\u6570\u5b57\u6bd4\u5341\u4f4d\u4e0a\u7684\u6570\u5b57\u76843\u500d\u5c112,\u82e5\u5c06\u4e09\u4e2a\u6570\u5b57\u987a\u5e8f\u98a0\u5012\u540e,\u6240\u5f97\u7684\u4e09\u4f4d\u6570\u4e0e\u539f\u4e09\u4f4d\u6570\u7684\u548c\u662f1171,\u6c42\u8fd9\u4e2a\u4e09\u4f4d\u6570.
\u8bbe\u5341\u4f4d\u6570\u4e3ax
\u5219 100\u00d7\uff08x+1)+10x+3x-2+100*(x+1)+10x+x+1=1171
\u5316\u7b80\u5f97
424x=1272
\u6240\u4ee5:x=3
\u5219\u8fd9\u4e2a\u4e09\u4f4d\u6570\u4e3a437
7.\u4e00\u5e74\u7ea7\u4e09\u4e2a\u73ed\u4e3a\u5e0c\u671b\u5c0f\u5b66\u6350\u8d60\u56fe\u4e66,\u4e00\u73ed\u5a1f\u4e86152\u518c,\u4e8c\u73ed\u6350\u4e66\u6570\u662f\u4e09\u4e2a\u73ed\u7ea7\u7684\u5e73\u5747\u6570,\u4e09\u73ed\u6350\u4e66\u6570\u662f\u5e74\u7ea7\u6350\u4e66\u603b\u6570\u768440%,\u4e09\u4e2a\u73ed\u5171\u6350\u4e86\u591a\u5c11\u56fe\u4e66?
\u89e3\uff1a\u8bbe\u2475\u73ed\u6350x\u518c
3x=152+x+3xX40%
3x=152+x+6/5x
3x-x-6/5x=152
4/5x=152
x=190\u2026\u2475\u73ed
190X3=570(\u672c\uff09
8.a b \u4e24\u5730\u76f8\u8ddd31\u5343\u7c73,\u7532\u4ecea\u5730\u9a91\u81ea\u884c\u8f66\u53bbb\u5730 \u4e00\u5c0f\u65f6\u540e\u4e59\u9a91\u6469\u6258\u8f66\u4e5f\u4ecea\u5730\u53bbb\u5730 \u5df2\u77e5\u7532\u6bcf\u5c0f\u65f6\u884c12\u5343\u7c73 \u4e59\u6bcf\u5c0f\u65f6\u884c28\u5343\u7c73 \u95ee\u4e59\u51fa\u53d1\u540e\u591a\u5c11\u5c0f\u65f6\u8ffd\u4e0a\u7532
\u8bbe\u4e59\u51fa\u53d1x\u5c0f\u65f6\u540e\u8ffd\u4e0a\u7532\uff0c\u5217\u65b9\u7a0b
12\uff08X+1\uff09=28X X=0.75\u5c0f\u65f6,\u537345\u5206\u949f
我们同岁呢(*^__^*) 嘻嘻……有问题Hi我把,
解：原式=y-x/x-y
=-（x-y/x-y）
=-1
分数的减法，分母相同，分子相减，得（y-x）/(x-y)=-1
(y-x)/(x-y)=-1
遇到这样的分式首先要考虑通分，
显然，分母相同，结果为-1.
主要用这些题培养练习者的解题思路。
我的看法是这样的，就是不知道对不对= y-x/x-y = -1
绛旓細1.瑙:54km/m=15m/s 鐏溅瀹為檯璧扮殑璺濈涓1156+224=1380m 鎵浠ラ渶瑕佺殑鏃堕棿涓92s 2.瑙ｏ細璁炬荤殑鏃堕棿涓簍 s 鎬荤殑璺▼涓簊 m s=t/2*6+t/2*4 鎵浠ュ钩鍧囬熷害涓簐=s/t=5 m/s
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