1/2+1/6+1/12+1/20+...+1/99X100,
1/2+1/6+1/12+1/20+...+1/99X100,
vf程序计算1x2x3x4x.x100
1X2+2X4+3X6+.50X100
简便计算1/2+1/2x3+1/3x4+1/4x5+...+1/99x100
1分之1x2+1分之2x3+1分之3x4.+1分之99x100
计算1x2+2x3+3x4+4x5+...+99x100
1x1-2x2+3x3-4x4+5x5-6x6.-100x100+101x101
观察下列各式 15²=1x(1+1)x100+5²=225,25²=2x(2+1)x100
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!
一定要帮我啊!(1/1x2)+(1/2x3)+(1/3x4)+(1/4x5)+.+(1/99x100)=?
(1-1/2x2)(1-1/3x3).(1-1/100x100)