1+x+x2+x3+…+x99+x100=?(x2表示x的平方)(x3表示x的立方) 今天就要
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1/2x2/3x3/4x…x99/100x100/101=多少
1+x+x2+x3+…+x99+x100=?(x2表示x的平方)(x3表示x的立方) 今天就要
1/1x2+1/2x3+1/3x4+……+1/98x99+1/99x100=……
1x2/1+2x3/1+3x4/1+……+98x99/1+99x100/1=?
求1x2,2x3,3x4,4x5,……98x99,99x100的倒数和如题
1/2x2/3x3/4...x99/100x100/101要过程.
1/2X2/3X3/4.X99/100X100/101递等式计算
1x1一2x2十3x3一4x4十5x5…十99x99一100x100
1/1X2+1/2x3+1/3x4+1/4x5+.+1/98x99+1/99x100求结果!
1/1x2+1/2x3+1/3x4+.1/98x99+1/99x100=?要注明运算过程
1/1x2+1/2x3+1/3x4.1/98x99+1/99x100怎么解
2/1x2+2/2x3+2/3x4+2/4x5+...+2/98x99+2/99x100
1x2+2x3+3x4+4x5+······98x99+99x100=?
1x1-2x2+3x3-4x4******+99x99-100x100+101x101的过程教教我
1X1+2X2+3X3+4X4+5X5.+98X98+99X99+100X100=?
100x100-99x99+98x98-97x97+.+4x4-x4-3x3+2x2-1计算
100X100-99X99-98X98-97X97+…+2X2-1X1=?
利用n 乘n/n+1=n-n/n+1这个规律计算:1/1x2+1/2x3+1/3x4………+1/98x99+1/99x100急用!