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1x1+0x1+2x2+1x2+3x3+2x3+4x4+3x4……99x99+98x99+100x100+99x100
4个回答
相关问题
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3x（1x2+2x3+3x4+……+99x100）= （A）97x98x99 （B）98x99x100 （C)99x 1
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1X1+2X2+3X3+4X4+5X5.+98X98+99X99+100X100=?
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100X100—99X99+98X98+...+2X2—1X1
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1x2+2x3+3x4+.99x100=?
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3x（1x2＋2x3＋3x4＋…＋99x100）＝
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100X100-99X99-98X98-97X97+…+2X2-1X1=?
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1x1一2x2十3x3一4x4十5x5…十99x99一100x100
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当X=-1时 求X+2X^2+3X^3+…+99^99+100X^100
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1/1x2x3+1/2x3x4.1/98x99x100拜托了各位
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计算100X100-99X99+98X98-97X97+...+2X2-1X1=