帮我出几道初二数学计算题 几道简单的初二数学计算题
\u8c01\u80fd\u7ed9\u6211100\u9053\u521d\u4e8c\u6570\u5b66\u8ba1\u7b97\u9898\uff1f\u4e00\u5143\u4e00\u6b21\u65b9\u7a0b
\u9009\u62e9\u9898
1\uff0e\u5df2\u77e5(x+y)\u2236(x-y)=3\u22361\uff0c\u5219x\u2236y=\uff08 \uff09\u3002
A\u30013\u22361 B\u30012\u22361 C\u30011\u22361 D\u30011\u22362
2\uff0e\u65b9\u7a0b-2x+ m=-3\u7684\u89e3\u662f3\uff0c\u5219m\u7684\u503c\u4e3a\uff08 \uff09\u3002
A\u30016 B\u3001-6 C\u3001 D\u3001-18
3\uff0e\u5728\u65b9\u7a0b6x+1=1\uff0c2x= \uff0c7x-1=x-1\uff0c5x=2-x\u4e2d\u89e3\u4e3a \u7684\u65b9\u7a0b\u4e2a\u6570\u662f\uff08 \uff09\u3002
A\u30011\u4e2a B\u30012\u4e2a C\u30013\u4e2a D\u30014\u4e2a
4\uff0e\u6839\u636e\u201ca\u76843\u500d\u4e0e-4\u7edd\u5bf9\u503c\u7684\u5dee\u7b49\u4e8e9\u201d\u7684\u6570\u91cf\u5173\u7cfb\u53ef\u5f97\u65b9\u7a0b\uff08 \uff09\u3002
A\u3001|3a-(-4)|=9 B\u3001|3a-4|=9
C\u30013|a|-|-4|=9 D\u30013a-|-4|=9
5\uff0e\u82e5\u5173\u4e8ex\u7684\u65b9\u7a0b =4(x-1)\u7684\u89e3\u4e3ax=3\uff0c\u5219a\u7684\u503c\u4e3a\uff08 \uff09\u3002
A\u30012 B\u300122 C\u300110 D\u3001-2
\u7b54\u6848\u4e0e\u89e3\u6790
\u7b54\u6848\uff1a1\u3001B 2\u3001A 3\u3001B 4\u3001D 5\u3001C
\u89e3\u6790\uff1a
1\uff0e\u5206\u6790\uff1a\u672c\u9898\u8003\u67e5\u5bf9\u7b49\u5f0f\u8fdb\u884c\u6052\u7b49\u53d8\u5f62\u3002
\u7531(x+y)\u2236(x-y)=3\u22361\uff0c\u77e5x+y=3(x-y)\uff0c\u5316\u7b80\u5f97\uff1ax+y=3x-3y\uff0c
\u5f972x-4y=0\uff0c\u5373x=2y\uff0cx\u2236y=2\u22361\u3002
2\uff0e\u5206\u6790\uff1a\u2235 3\u662f\u65b9\u7a0b-2x+ m=-3\u7684\u89e3\uff0c
\u2234 -2\u00d73+ m=-3\uff0c
\u5373\uff0d6+ m=-3\uff0c
\u2234 m=-3+6\uff0c\u2014\u2014\u6839\u636e\u7b49\u5f0f\u7684\u57fa\u672c\u6027\u8d281
\u2234 m=6\uff0c\u2014\u2014\u6839\u636e\u7b49\u5f0f\u7684\u57fa\u672c\u6027\u8d282
\u2234 \u9009A\u3002
3\uff0e\u5206\u6790\uff1a6x+1=1\u7684\u89e3\u662f0\uff0c2x= \u7684\u89e3\u662f \uff0c7x-1=x-1\u7684\u89e3\u662f0\uff0c5x=2-x\u7684\u89e3\u662f \u3002
4\uff0e\u7565\u3002
5\uff0e\u5206\u6790\uff1a\u56e0\u4e3ax=3\u662f\u65b9\u7a0b =4(x-1)\u7684\u89e3\uff0c\u6545\u5c06x=3\u4ee3\u5165\u65b9\u7a0b\u6ee1\u8db3\u7b49\u5f0f\u3002
\u4e00\u3001 \u591a\u53d8\u91cf\u578b
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\u89e3\u5f97\uff1a
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\u4e8c\u3001 \u5206\u6bb5\u578b
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\u4f8b\u4e8c\uff1a\uff082005\u5e74\u4e1c\u8425\u5e02\uff09\u67d0\u6c34\u679c\u6279\u53d1\u5e02\u573a\u9999\u8549\u7684\u4ef7\u683c\u5982\u4e0b\u8868\uff1a
\u8d2d\u4e70\u9999\u8549\u6570
(\u5343\u514b) \u4e0d\u8d85\u8fc7
20\u5343\u514b 20\u5343\u514b\u4ee5\u4e0a
\u4f46\u4e0d\u8d85\u8fc740\u5343\u514b 40\u5343\u514b\u4ee5\u4e0a
\u6bcf\u5343\u514b\u4ef7\u683c 6\u5143 5\u5143 4\u5143
\u5f20\u5f3a\u4e24\u6b21\u5171\u8d2d\u4e70\u9999\u854950\u5343\u514b\uff08\u7b2c\u4e8c\u6b21\u591a\u4e8e\u7b2c\u4e00\u6b21\uff09\uff0c\u5171\u4ed8\u51fa264\u5143\uff0c \u8bf7\u95ee\u5f20\u5f3a\u7b2c\u4e00\u6b21\u3001\u7b2c\u4e8c\u6b21\u5206\u522b\u8d2d\u4e70\u9999\u8549\u591a\u5c11\u5343\u514b\uff1f
\u5206\u6790\uff1a\u7531\u4e8e\u5f20\u5f3a\u4e24\u6b21\u5171\u8d2d\u4e70\u9999\u854950\u5343\u514b\uff08\u7b2c\u4e8c\u6b21\u591a\u4e8e\u7b2c\u4e00\u6b21\uff09\uff0c\u90a3\u4e48\u7b2c\u4e8c\u6b21\u8d2d\u4e70\u9999\u8549\u591a\u4e8e25\u5343\u514b\uff0c\u7b2c\u4e00\u6b21\u5c11\u4e8e25\u5343\u514b\u3002\u7531\u4e8e50\u5343\u514b\u9999\u8549\u5171\u4ed8264\u5143\uff0c\u5176\u5e73\u5747\u4ef7\u683c\u4e3a5.28\u5143\uff0c\u6240\u4ee5\u5fc5\u7136\u7b2c\u4e00\u6b21\u8d2d\u4e70\u9999\u8549\u7684\u4ef7\u683c\u4e3a6\u5143/\u5343\u514b\uff0c\u5373\u5c11\u4e8e20\u5343\u514b\uff0c\u7b2c\u4e8c\u6b21\u8d2d\u4e70\u7684\u9999\u8549\u4ef7\u683c\u53ef\u80fd5\u5143\uff0c\u4e5f\u53ef\u80fd4\u5143\u3002\u6211\u4eec\u518d\u5206\u4e24\u79cd\u60c5\u51b5\u8ba8\u8bba\u5373\u53ef\u3002
\u89e3\uff1a
1) \u5f53\u7b2c\u4e00\u6b21\u8d2d\u4e70\u9999\u8549\u5c11\u4e8e20\u5343\u514b\uff0c\u7b2c\u4e8c\u6b21\u9999\u854920\u5343\u514b\u4ee5\u4e0a\u4f46\u4e0d\u8d85\u8fc740\u5343\u514b\u7684\u65f6\u5019\uff0c\u8bbe\u7b2c\u4e00\u6b21\u8d2d\u4e70x\u5343\u514b\u9999\u8549\uff0c\u7b2c\u4e8c\u6b21\u8d2d\u4e70\uff0850\uff0dx\uff09\u5343\u514b\u9999\u8549\uff0c\u6839\u636e\u9898\u610f\uff0c\u5f97\uff1a
6x\uff0b5\uff0850\uff0dx\uff09\uff1d264
\u89e3\u5f97\uff1ax\uff1d14
50\uff0d14\uff1d36\uff08\u5343\u514b\uff09
2\uff09\u5f53\u7b2c\u4e00\u6b21\u8d2d\u4e70\u9999\u8549\u5c11\u4e8e20\u5343\u514b\uff0c\u7b2c\u4e8c\u6b21\u9999\u8549\u8d85\u8fc740\u5343\u514b\u7684\u65f6\u5019\uff0c\u8bbe\u7b2c\u4e00\u6b21\u8d2d\u4e70x\u5343\u514b\u9999\u8549\uff0c\u7b2c\u4e8c\u6b21\u8d2d\u4e70\uff0850\uff0dx\uff09\u5343\u514b\u9999\u8549\uff0c\u6839\u636e\u9898\u610f\uff0c\u5f97\uff1a
6x\uff0b4\uff0850\uff0dx\uff09\uff1d264
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\u4f4f\u9662\u533b\u7597\u8d39\uff08\u5143\uff09 \u62a5\u9500\u7387\uff08%\uff09
\u4e0d\u8d85\u8fc7500\u5143\u7684\u90e8\u5206 0
\u8d85\u8fc7500\uff5e1000\u5143\u7684\u90e8\u5206 60
\u8d85\u8fc71000\uff5e3000\u5143\u7684\u90e8\u5206 80
\u2026\u2026
A\u30011000\u5143 B\u30011250\u5143 C\u30011500\u5143 D\u30012000\u5143
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500\u00d760\uff05\uff0b(x\uff0d1000)80%\uff1d1100
\u89e3\u5f97\uff1ax\uff1d2000
\u6240\u4ee5\u672c\u9898\u7b54\u6848D\u3002
\u4e09\u3001 \u65b9\u6848\u578b
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\u4f8b\u56db\uff1a\uff082005\u5e74\u6cc9\u5dde\u5e02\uff09\u67d0\u6821\u521d\u4e09\u5e74\u7ea7\u5b66\u751f\u53c2\u52a0\u793e\u4f1a\u5b9e\u8df5\u6d3b\u52a8\uff0c\u539f\u8ba1\u5212\u79df\u752830\u5ea7\u5ba2\u8f66\u82e5\u5e72\u8f86\uff0c\u4f46\u8fd8\u670915\u4eba\u65e0\u5ea7\u4f4d\u3002
\uff081\uff09\u8bbe\u539f\u8ba1\u5212\u79df\u752830\u5ea7\u5ba2\u8f66x\u8f86\uff0c\u8bd5\u7528\u542bx\u7684\u4ee3\u6570\u5f0f\u8868\u793a\u8be5\u6821\u521d\u4e09\u5e74\u7ea7\u5b66\u751f\u7684\u603b\u4eba\u6570\uff1b
\uff082\uff09\u73b0\u51b3\u5b9a\u79df\u752840\u5ea7\u5ba2\u8f66\uff0c\u5219\u53ef\u6bd4\u539f\u8ba1\u5212\u79df30\u5ea7\u5ba2\u8f66\u5c11\u4e00\u8f86\uff0c\u4e14\u6240\u79df40\u5ea7\u5ba2\u8f66\u4e2d\u6709\u4e00\u8f86\u6ca1\u6709\u5750\u6ee1\uff0c\u53ea\u575035\u4eba\u3002\u8bf7\u4f60\u6c42\u51fa\u8be5\u6821\u521d\u4e09\u5e74\u7ea7\u5b66\u751f\u7684\u603b\u4eba\u6570\u3002
\u5206\u6790\uff1a\u672c\u9898\u8868\u793a\u521d\u4e09\u5e74\u7ea7\u603b\u4eba\u6570\u6709\u4e24\u79cd\u65b9\u6848\uff0c\u752830\u5ea7\u5ba2\u8f66\u7684\u8f86\u6570\u8868\u793a\u603b\u4eba\u6570\uff1a30x+15
\u752840\u5ea7\u5ba2\u8f66\u7684\u8f86\u6570\u8868\u793a\u603b\u4eba\u6570\uff1a40\uff08x\uff0d2\uff09+35\u3002
\u89e3\uff1a\uff081\uff09\u8be5\u6821\u521d\u4e09\u5e74\u7ea7\u5b66\u751f\u7684\u603b\u4eba\u6570\u4e3a\uff1a30x+15
\uff082\uff09\u7531\u9898\u610f\u5f97\uff1a
30x+15\uff1d40\uff08x\uff0d2\uff09+35
\u89e3\u5f97\uff1ax\uff1d6
30x\uff0b15\uff1d30\u00d76\uff0b15\uff1d195\uff08\u4eba\uff09
\u7b54\uff1a\u521d\u4e09\u5e74\u7ea7\u603b\u5171195\u4eba\u3002
\u56db\u3001 \u6570\u636e\u5904\u7406\u578b
\u6570\u636e\u5904\u7406\u578b\u4e00\u5143\u4e00\u6b21\u65b9\u7a0b\u89e3\u5e94\u7528\u9898\u5f80\u5f80\u4e0d\u76f4\u63a5\u544a\u8bc9\u6211\u4eec\u4e00\u4e9b\u6761\u4ef6\uff0c\u9700\u8981\u6211\u4eec\u5bf9\u6240\u7ed9\u7684\u6570\u636e\u8fdb\u884c\u5206\u6790\uff0c\u83b7\u53d6\u6211\u4eec\u6240\u9700\u7684\u6570\u636e\u3002
\u4f8b\u4e94\uff1a(2004\u5e74\u5317\u4eac\u6d77\u6dc0\u533a)\u89e3\u5e94\u7528\u9898\uff1a2004\u5e744\u6708\u6211\u56fd\u94c1\u8def\u7b2c5\u6b21\u5927\u63d0\u901f\uff0e\u5047\u8bbeK120\u6b21\u7a7a\u8c03\u5feb\u901f\u5217\u8f66\u7684\u5e73\u5747\u901f\u5ea6\u63d0\u901f\u540e\u6bd4\u63d0\u901f\u524d\u63d0\u9ad8\u4e8644\u5343\u7c73\uff0f\u65f6\uff0c\u63d0\u901f\u524d\u7684\u5217\u8f66\u65f6\u523b\u8868\u5982\u4e0b\u8868\u6240\u793a\uff1a
\u884c\u9a76\u533a\u95f4 \u8f66\u6b21 \u8d77\u59cb\u65f6\u523b \u5230\u7ad9\u65f6\u523b \u5386\u65f6 \u5168\u7a0b\u91cc\u7a0b
A\u5730\u2014B\u5730 K120 2\uff1a00 6\uff1a00 4\u5c0f\u65f6 264\u5343\u7c73
\u8bf7\u4f60\u6839\u636e\u9898\u76ee\u63d0\u4f9b\u7684\u4fe1\u606f\u586b\u5199\u63d0\u901f\u540e\u7684\u5217\u8f66\u65f6\u523b\u8868\uff0c\u5e76\u5199\u51fa\u8ba1\u7b97\u8fc7\u7a0b\uff0e
\u884c\u9a76\u533a\u95f4 \u8f66\u6b21 \u8d77\u59cb\u65f6\u523b \u5230\u7ad9\u65f6\u523b \u5386\u65f6 \u5168\u7a0b\u91cc\u7a0b
A\u5730\u2014B\u5730 K120 2\uff1a00 264\u5343\u7c73
\u89e3\uff1a
\u884c\u9a76\u533a\u95f4 \u8f66\u6b21 \u8d77\u59cb\u65f6\u523b \u5230\u7ad9\u65f6\u523b \u5386\u65f6 \u5168\u7a0b\u91cc\u7a0b
A\u5730\u2014B\u5730 K120 2\uff1a00 4\uff1a24 2.4\u5c0f\u65f6 264\u5343\u7c73
\u5206\u6790\uff1a\u901a\u8fc7\u8868\u4e00\u6211\u4eec\u53ef\u4ee5\u5f97\u77e5\u63d0\u901f\u524d\u7684\u706b\u8f66\u901f\u5ea6\u4e3a264\u00f74\uff1d66\u5343\u7c73\uff0f\u65f6\uff0c\u4ece\u800c\u5f97\u51fa\u63d0\u901f\u540e\u7684\u901f\u5ea6\uff0c\u518d\u6839\u636e\u8868\u4e8c\u5df2\u7ecf\u7ed9\u7684\u6570\u636e\uff0c\u7b97\u51fa\u8981\u6c42\u7684\u503c\u3002
\u89e3\uff1a\u8bbe\u5217\u8f66\u63d0\u901f\u540e\u884c\u9a76\u65f6\u95f4\u4e3ax\u5c0f\u65f6. \u6839\u636e\u9898\u610f\uff0c\u5f97
\u7ecf\u68c0\u9a8c\uff0cx=2.4\u7b26\u5408\u9898\u610f\uff0e
\u7b54\uff1a\u5230\u7ad9\u65f6\u523b\u4e3a4:24\uff0c\u5386\u65f62.4\u5c0f\u65f6
\u4f8b\u516d\uff1a\uff082005\u6d59\u6c5f\u7701\uff09\u636e\u4e86\u89e3\uff0c\u706b\u8f66\u7968\u4ef7\u6309\u201c \u201d\u7684\u65b9\u6cd5\u6765\u786e\u5b9a\uff0e\u5df2\u77e5A\u7ad9\u81f3H\u7ad9\u603b\u91cc\u7a0b\u6570\u4e3a1 500\u5343\u7c73\uff0c\u5168\u7a0b\u53c2\u8003\u4ef7\u4e3a180\u5143\uff0e\u4e0b\u8868\u662f\u6cbf\u9014\u5404\u7ad9\u81f3H\u7ad9\u7684\u91cc\u7a0b\u6570\uff1a
\u8f66\u7ad9\u540d A B C D E F G H
\u5404\u7ad9\u81f3H\u7ad9\u7684\u91cc\u7a0b\u6570\uff08\u5355\u4f4d\uff1a\u5343\u7c73\uff09 1500 1130 910 622 402 219 72 0
\u4f8b\u5982\uff0c\u8981\u786e\u5b9a\u4eceB\u7ad9\u81f3E\u7ad9\u706b\u8f66\u7968\u4ef7\uff0c\u5176\u7968\u4ef7\u4e3a (\u5143)\uff0e
(1) \u6c42A\u7ad9\u81f3F\u7ad9\u7684\u706b\u8f66\u7968\u4ef7(\u7ed3\u679c\u7cbe\u786e\u52301\u5143)\uff1b
(2) \u65c5\u5ba2\u738b\u5927\u5988\u4e58\u706b\u8f66\u53bb\u5973\u513f\u5bb6\uff0c\u4e0a\u8f66\u8fc7\u4e24\u7ad9\u540e\u62ff\u7740\u706b\u8f66\u7968\u95ee\u4e58\u52a1\u5458\uff1a\u6211\u5feb\u5230\u7ad9\u4e86\u5417\uff1f\u4e58\u52a1\u5458\u770b\u5230\u738b\u5927\u5988\u624b\u4e2d\u7968\u4ef7\u662f66\u5143\uff0c\u9a6c\u4e0a\u8bf4\u4e0b\u4e00\u7ad9\u5c31\u5230\u4e86\uff0e\u8bf7\u95ee\u738b\u5927\u5988\u662f\u5728\u54ea\u4e00\u7ad9\u4e0b\u8f66\u7684\uff1f\uff08\u8981\u6c42\u5199\u51fa\u89e3\u7b54\u8fc7\u7a0b\uff09\uff0e
\u89e3\uff1a (1) \u89e3\u6cd5\u4e00\uff1a\u7531\u5df2\u77e5\u53ef\u5f97 \uff0e
A\u7ad9\u81f3F\u7ad9\u5b9e\u9645\u91cc\u7a0b\u6570\u4e3a1500\uff0d219=1281\uff0e
\u6240\u4ee5A\u7ad9\u81f3F\u7ad9\u7684\u706b\u8f66\u7968\u4ef7\u4e3a 0.12 1281=153.72 154(\u5143)
\u89e3\u6cd5\u4e8c\uff1a\u7531\u5df2\u77e5\u53ef\u5f97A\u7ad9\u81f3F\u7ad9\u7684\u706b\u8f66\u7968\u4ef7\u4e3a (\u5143)\uff0e
(2)\u8bbe\u738b\u5927\u5988\u5b9e\u9645\u4e58\u8f66\u91cc\u7a0b\u6570\u4e3ax\u5343\u7c73\uff0c\u6839\u636e\u9898\u610f\uff0c\u5f97\uff1a \uff0e
\u89e3\u5f97 x= (\u5343\u7c73)\uff0e
\u5bf9\u7167\u8868\u683c\u53ef\u77e5\uff0c D\u7ad9\u4e0eG\u7ad9\u8ddd\u79bb\u4e3a550\u5343\u7c73\uff0c\u6240\u4ee5\u738b\u5927\u5988\u662fD\u7ad9\u6216G\u7ad9\u4e0b\u7684\u8f66
\uff0e
\u82e510\u7684m\u6b21\u65b9=20\uff0c10\u7684n\u6b21\u65b9=5\u5206\u4e4b\u4e00\uff0c\u6c429\u7684m\u6b21\u65b9\u9664\u4ee53\u76842n\u6b21\u65b9\u7684\u503c
\u7b54\u684810^m\u00f710^n=20\u00f71/5
10^(m-n)=100=10^2
\u6240\u4ee5m-n=2
9^m\u00f73^2n
=9^m\u00f7(3^2)^n
=9^m\u00f79^n
=9^(m-n)
=9^2
=81
75\u00f7\u3014138\u00f7\uff08100-54\uff09\u3015 85\u00d7(95\uff0d1440\u00f724)
80400\uff0d(4300\uff0b870\u00f715) 240\u00d778\u00f7\uff08154-115\uff09
1437\u00d727\uff0b27\u00d7563 \u301475-\uff0812+18\uff09\u3015\u00f715
2160\u00f7\u3014\uff0883-79\uff09\u00d718\u3015 280\uff0b840\u00f724\u00d75
325\u00f713\u00d7(266\uff0d250) 85\u00d7(95\uff0d1440\u00f724)
58870\u00f7(105\uff0b20\u00d72) 1437\u00d727\uff0b27\u00d7563
81432\u00f7(13\u00d752\uff0b78) [37.85-\uff087.85+6.4\uff09] \u00d730
156\u00d7[(17.7-7.2)\u00f73] \uff08947\uff0d599\uff09\uff0b76\u00d764
36\u00d7(913\uff0d276\u00f723) [192\uff0d\uff0854\uff0b38\uff09]\u00d767
[\uff087.1-5.6\uff09\u00d70.9-1.15]\u00f72.5 81432\u00f7(13\u00d752\uff0b78)
5.4\u00f7[2.6\u00d7\uff083.7-2.9\uff09+0.62] \uff08947\uff0d599\uff09\uff0b76\u00d764 60\uff0d(9.5\uff0b28.9)]\u00f70.18 2.881\u00f70.43\uff0d0.24\u00d73.5 20\u00d7[(2.44\uff0d1.8)\u00f70.4\uff0b0.15] 28-(3.4 1.25\u00d72.4) 0.8\u00d7\u301415.5-(3.21 5.79)\u3015 \uff0831.8 3.2\u00d74\uff09\u00f75 194\uff0d64.8\u00f71.8\u00d70.9 36.72\u00f74.25\u00d79.9 3.416\u00f7\uff080.016\u00d735\uff09 0.8\u00d7[(10\uff0d6.76)\u00f71.2]
\uff08136+64\uff09\u00d7\uff0865-345\u00f723\uff09 (6.8-6.8\u00d70.55)\u00f78.5
0.12\u00d7 4.8\u00f70.12\u00d74.8 \uff0858+37\uff09\u00f7\uff0864-9\u00d75\uff09
812-700\u00f7\uff089+31\u00d711\uff09 \uff083.2\u00d71.5+2.5\uff09\u00f71.6
85+14\u00d7\uff0814+208\u00f726\uff09 120-36\u00d74\u00f718+35
\uff08284+16\uff09\u00d7\uff08512-8208\u00f718\uff09 9.2
\u00d71.6-18.305\u00f77
4/7\u00f7[1/3\u00d7\uff083/5-3/10\uff09] \uff084/5+1/4\uff09\u00f77/3+7/10
12.78\uff0d0\u00f7\uff08 13.4\uff0b156.6 \uff09 37.812-700\u00f7\uff089+31\u00d711\uff09 \uff08136+64\uff09\u00d7\uff0865-345\u00f723\uff09 3.2\u00d7\uff081.5+2.5\uff09\u00f71.6
85+14\u00d7\uff0814+208\u00f726\uff09 \uff0858+37\uff09\u00f7\uff0864-9\u00d75\uff09
(6.8-6.8\u00d70.55)\u00f78.5 \uff08284+16\uff09\u00d7\uff08512-8208\u00f718\uff09
0.12\u00d7 4.8\u00f70.12\u00d74.8 \uff083.2\u00d71.5+2.5\uff09\u00f71.6
120-36\u00d74\u00f718+35 10.15-10.75\u00d70.4-5.7
5.8\u00d7\uff083.87-0.13\uff09+4.2\u00d73.74 347+45\u00d72-4160\u00f752
32.52-\uff086+9.728\u00f73.2\uff09\u00d72.5 87\uff0858+37\uff09\u00f7\uff0864-9\u00d75\uff09
[\uff087.1-5.6\uff09\u00d70.9-1.15] \u00f72.5 \uff083.2\u00d71.5+2.5\uff09\u00f71.6
5.4\u00f7[2.6\u00d7\uff083.7-2.9\uff09+0.62] 12\u00d76\u00f7\uff0812-7.2\uff09-6
3.2\u00d76+\uff081.5+2.5\uff09\u00f71.6 \uff083.2\u00d71.5+2.5\uff09\u00f71.6
5.8\u00d7\uff083.87-0.13\uff09+4.2\u00d73.74
\u521d\u4e8c\u6570\u5b66\u8ba1\u7b97\u9898
[\uff082x5+2)(4x7+2)(6x9+2)......(2002x2005+2)]/[(1x4+2)(3x6+2)(5x8+2)......(2001x2004+2)]
\u95ee\u9898\u8865\u5145\uff1a\u6c42\u8fc7\u7a0b
\u5982\u679c\u4f60\u628a\u5206\u5b50\u770b\u505a[(n+1)(n+4)+2]\u8fd9\u6837\u7684\u7ec4\u5408\u5c31\u6e05\u695a\u591a\u4e86\uff0c\u56e0\u4e3a[(n+1)(n+4)+2]=n^2+5n+6=(n+2)(n+3) ,\u800c\u6bcf\u4e24\u4e2a\u76f8\u90bb\u7684\u4e58\u6570\u4e4b\u95f4\u95f4\u9694\u4e3a2\uff0c\u6240\u4ee5\u5206\u5b50\u53ef\u4ee5\u770b\u505a(n+2)(n+3)(n+4)(n+5)...
\u56e0\u6b64\u5206\u5b50\u662f3*4*5*6*...*2003*2004
\u540c\u7406\u5206\u6bcd\u53ef\u4ee5\u5316\u4e3a2*3*4*5*...*2002*2003
\u8fd9\u6837\u5206\u5b50\u5206\u6bcd\u5c06\u76f8\u540c\u56e0\u5b50\u6d88\u6389\u5f97\u5230\uff1a
[\uff082x5+2)(4x7+2)(6x9+2)......(2002x2005+2)]/[(1x4+2)(3x6+2)(5x8+2)......(2001x2004+2)]
=\uff083*4*5*6*...*2003*2004\uff09/(2*3*4*5*...*2002*2003)
=2004/2
=1002
\uff081-1/2²\uff09\uff081-1/3²\uff09\uff081-1/4²\uff09\u2026\u2026\uff081-1/100²\uff09
1-1/2\uff09\uff081+1/2\uff09\uff081-1/3\uff09\uff081+1/3\uff09\uff081-1/4\uff09\uff081+1/4\uff09\u2026\u2026\uff081-1/100\uff09\uff081+1/100\uff09
=1/2\u00d73/2\u00d72/3\u00d74/3\u00d73/4\u00d7\u2026\u202699/100\u00d7101/100
=1/2\u00d7101/100
=101/200
2x-6/4-4x+x^2\u9664\u4ee5(x+3)*(x+3)(x-2)/3-x
[(x^2+2x-3)/(x+3)]\u00d7[-(x-3)(x-2)/(X-3)]
=-(x-1)\u00d7(x-2)
=-X^2+3x-2
\uff081\uff09\uff1a [(a+2b)^4]^3*(-a-2b)
=-(a+2b)^12*(a+2b)
=-(a+2b)^13
\uff082\uff09\uff1a \uff08\u221a3\uff09^3*(-\u221a3)^5
=-\uff08\u221a3\uff09^3*(\u221a3)^5
=-\uff08\u221a3\uff098
=-3^1/2*8
=-3^4
=-81
\uff083\uff09\uff1a (3xy)^11*[(1/81)x]^3
=(3xy)^11*[(1/3^4)x]^3
=(3xy)^11*(1/3)^12x^3
=3^11*(1/3)^11*1/3*(xy)^11*x^3
=1/3*(xy)^11*x^3
=1/3x^14y^11
\uff084\uff09(2x^3)^3-7x^5*(-x^2)^2+[-(2/3)x^2]^3*(-x^3)
=8x^9-7x^9+8/27x^9
=x^9+8/27x^9
=35/27x^9
\uff085\uff09 \u2460\u3002\u5df2\u77e53^n-1=2,\u6c423^n-1*3^2n-1\u7684\u503c
3^n-1*3^2n-1
=3^3n-3
=(3^n-1)^3
=2^3
=8
\u2461.\u82e532*64*128=2^n+30\uff0c\u6c42n\u7684\u503c
32*64*128=2^n+30
2^5*2^6*2^7=2^n+30
2^18=2^n+30
18=n+30
n=-12
\u2462.\u5df2\u77e5a, b\u4e3a\u6b63\u6574\u6570\uff0c\u4e14 a>b,2^a*2^b=32, \u6c42a^b\u7684\u503c
2^a*2^b=32
2^a+b=2^5
a+b=5
a>b
a=4,b=1 \u6216 a=3,b=2
a^b=4^1=4
\u6216
a^b=3^2=9
\uff086\uff09\uff1a \u5df2\u77e5x, y\u81f3\u5c11\u6709\u4e00\u4e2a\u662f\u5076\u6570\uff0c\u6c42[(-a)^x]^y*(-a^2)^2\u7684\u503c
[(-a)^x]^y*(-a^2)^2
=(-a)^xy*a^4(\u5df2\u77e5x, y\u81f3\u5c11\u6709\u4e00\u4e2a\u662f\u5076\u6570)
=a^xy*a^4
=a^(xy+4)
\uff087\uff09\uff1a \u5df2\u77e5a^m=9,a^n=6,a^k=2\uff0c\u6c42a^2k*[a^(m+2k)-a^(m+3k)]\u7684\u503c
a^2k*[a^(m+2k)-a^(m+3k)]
=(a^k)^2*[a^(m+2k)-a^(m+3k)
=(a^k)^2*[a^(m+2k)-a^(m+2k)*a^k]
=4*[a^(m+2k)-a^(m+2k)*a^k]
=4*a^(m+2k)(1-a^k)
=4*a^m*a^2k(1-2)
=-4*a^m*a^2k
=-4*9*(a^k)^2
=-36*4
=-144
=
解:去分母,得x+2+k(x-2)=4
解得x+k(x-2)=2
把x=-2代入原方程,得-2+k(-2-2)=2
解得k=-1
x/y=2,求2x+y/x-y的值.
解：x/y=2,x=2y
2x+y/x-y
=5y/y=51、当1/x-1/y=5时，求分式(3x+5xy-3y)÷(x-3xy-y)的值。
答案：5/4
2、已知a+b+c=0,求a(1/b+1/c)+b(1/c+1/a)+c(1/a+1/b)的值。
答案：－3
3、解方程：（x-8）/(x-3)-(x-9)/(x-4)=(x+7)/(x+8)-(x+2)/(x+3)
答案：x＝－2/3
4、当a为何值时，关于x的方程x/(x-3)=2+a/(x-3)会产生增根？
答案：当a＝3时，此分式方程会产生增根。
5、华联商厦进货员在苏州发现一种应季衬衫，预计能畅销，就用80000元购进所有衬衫，还急需2倍这种衬衫，经人介绍又在上海用176000元购进所需衬衫，只是单价比苏州贵4元。商厦按每件58元销售，销路很好，最后剩下的150件按8折销售，很快售完，问这笔生意商厦赢利多少元？
答案：这笔生意赢利90260元。
6、小明家准备装修一套新住房，若甲、乙两个装饰公司，合作需6周完成，需工钱5.2万元；若甲公司单独作4周后，剩下的由乙公司来作，还需9周才能完成，需工钱4.8万元。若只选一个公司单独完成，从节约开支角度考虑，小明家是选甲公司还是乙公司？请你说明理由。
答案：从节约开支的角度考虑，应选乙公司单独完成。
7、对于分式（x-5）/(2x-1),当x_______时有意义，当x________时无意义。
答案：不等于1/2；1/2
8、方程(x-3)/(x-1)=m/(x-1)有增根，则增根为_____，m的值为______
答案：1；－2
www.csdzzx.com里面全是好题
[x-(x-4)/(x-3)]/(x*x-4)/(x-3)
(x-2)/(x+2)
你没说是上学期还是下学期
第二题根号10大于3小于4
所以整数部分是8，即a=8
小数b=5
根号10-8=根号10-3
a-b=8-（根号10-3）=11-根号10
3.
(4-4x
x²)
|2x-6|
=
根号(x-2)^2
|2x-6|
因为2＜x＜3
所以原式=x-2
6-2x=4-x
4
根据题意x=正负2，y=正负1
因为|x-y|=y-x
所以x-y<0
x<y
①y=-1,x=-2
②y=1
x=-2
所以x
y=-3或者-1
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绛旓細鈶5鈭8-2鈭32+鈭50 =5*3鈭2-2*4鈭2+5鈭2 =鈭2(15-8+5)=12鈭2 鈶♀垰6-鈭3/2-鈭2/3 =鈭6-鈭6/2-鈭6/3 =鈭6/6 鈶(鈭45+鈭27)-(鈭4/3+鈭125)=(3鈭5+3鈭3)-(2鈭3/3+5鈭5)=-2鈭5+7鈭5/3 鈶(鈭4a-鈭50b)-2(鈭歜/2+鈭9a)=(2鈭歛-5鈭2b)-2(鈭2b/...
绛旓細75梅銆138梅锛100-54锛夈 85脳(95锛1440梅24)80400锛(4300锛870梅15) 240脳78梅锛154-115锛1437脳27锛27脳563 銆75-锛12+18锛夈暶15 2160梅銆旓紙83-79锛壝18銆 280锛840梅24脳5 325梅13脳(266锛250) 85脳(95锛1440梅24)58870梅(105锛20脳2) 1437脳27锛27脳563 81432梅(13脳52锛...
