把减的数都放一边 就剩下2乘以从1加到100然后减的数字实际就是一到一百
所以是一个1 加到100最后等于5050
2X1-2+2X2-3+2X3-`4+2X4-5+…十2X99_100十2X100_101
1个回答
相关问题
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1x1一2x2十3x3一4x4十5x5…十99x99一100x100
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1/1x2十1/2x3十1/3x4十..….十1/99x100=?
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1x1+0x1+2x2+1x2+3x3+2x3+4x4+3x4……99x99+98x99+100x100+99x100
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1x2十2x3十...十99x100等于多少
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1x1-2x2+3x3-4x4+5x5-6x6.-100x100+101x101
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1X1+2X2+3X3+4X4+5X5.+98X98+99X99+100X100=?
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1x2+2x3+3x4+.99x100=?
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1x(乘号）2+2x3+3x4+.+100x101=?
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3x（1x2＋2x3＋3x4＋…＋99x100）＝
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1）1x2+2x3+3x4+...+100x101= 2）1x2+2x3+3x4+...n(n+1)= （3）1x2x3