请问这道题怎么做:1/(1X2)+1/(2X3)+1/(3X4)+…+1/(99X100)=
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请问这道题怎么做:1/(1X2)+1/(2X3)+1/(3X4)+…+1/(99X100)=
请列出计算方法,谢谢!
请列出计算方法,谢谢!
![请问这道题怎么做:1/(1X2)+1/(2X3)+1/(3X4)+…+1/(99X100)=](/uploads/image/z/17205704-8-4.jpg?t=%E8%AF%B7%E9%97%AE%E8%BF%99%E9%81%93%E9%A2%98%E6%80%8E%E4%B9%88%E5%81%9A%EF%BC%9A1%2F%281X2%29%2B1%2F%282X3%29%2B1%2F%283X4%29%2B%E2%80%A6%2B1%2F%2899X100%29%3D)
通项1/n(n+1)=1/n-1/(n+1)
1/(1X2)+1/(2X3)+1/(3X4)+…+1/(99X100)
=(1/1-1/2)+(1/2-1/3)+…+(1/99-1/100)
=1-1/100
=99/100
1/(1X2)+1/(2X3)+1/(3X4)+…+1/(99X100)
=(1/1-1/2)+(1/2-1/3)+…+(1/99-1/100)
=1-1/100
=99/100
1分之1x2+1分之2x3+1分之3x4.+1分之99x100
计算1x2+2x3+3x4+4x5+...+99x100
一定要帮我啊!(1/1x2)+(1/2x3)+(1/3x4)+(1/4x5)+.+(1/99x100)=?
求1x2,2x3,3x4,4x5,……98x99,99x100的倒数和
1x1-2x2+3x3-4x4+5x5-6x6.-100x100+101x101
1/1x2+1/2x3+1/3x4+1/4x5+.+1/98x99+1/99x100
1/1X2+1/2x3+1/3x4+1/4x5+.+1/98x99+1/99x100求结果!
2/1x2+2/2x3+2/3x4+2/4x5+...+2/98x99+2/99x100
1X2+2X4+3X6+.50X100
1/(1x2)+1/(2x3)+1/(3x4)+......+1/(99x100)=?要计算过程.
简便计算1/2+1/2x3+1/3x4+1/4x5+...+1/99x100
求线性方程组 x2-x3-x4=0 x1+x2-x3+3x4=1 x1-x2+x3+5x4=-1 x1+2x2-2x3+