每两项加一起 得50x的平方
计算：-x^2+2x^2-3x^2+4x^2+……+98x^2-99x^2+100x^2=?
2个回答
相关问题
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1x1+0x1+2x2+1x2+3x3+2x3+4x4+3x4……99x99+98x99+100x100+99x100
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计算100X100-99X99+98X98-97X97+...+2X2-1X1=
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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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3x（1x2+2x3+3x4+……+99x100）= （A）97x98x99 （B）98x99x100 （C)99x 1
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100X100-99X99-98X98-97X97+…+2X2-1X1=?
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2X1-2+2X2-3+2X3-`4+2X4-5+…十2X99_100十2X100_101
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1/1x2x3+1/2x3x4.1/98x99x100拜托了各位
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1x2+2x3+3x4+.99x100=?
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1/x(x+1)(x+2)+1/(x+1)(x+2)(x+3).+1/(x+98)(x+99)(x+100)=?