99/(1x2x3)+98/(2x3x4)+97/(3x4x5)+...+1/(99x100x101)
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99/(1x2x3)+98/(2x3x4)+97/(3x4x5)+...+1/(99x100x101)
99/(1x2x3)+98/(2x3x4)+97/(3x4x5)+...+1/(99x100x101)
99/(1x2x3)+98/(2x3x4)+97/(3x4x5)+...+1/(99x100x101)
1/1x2x3+1/2x3x4+.+1/98x99x100 .
求和:1X2X3+2X3X4+3X4X5+...+98X99X100
99/(1x2x3)+98/(2x3x4)+97/(3x4x5)+...+1/(99x100x101)
1x2x3+2x3x4+...+nxx=?
1/1x2x3+1/2x3x4+1/3x4x51/2x3x4 + 1/3x4x5 + 1/4x5x6 +……+1/99x100x101是 1/(2x3x4)
2/1x2x3+2/2x3x4+2/3x4x5+2/4x5x6+...+2/98x99x100=
1/1x2x3+1/2x3x4+1/3x4x5+------+1/98x99x100=
1/1x2x3+1/2x3x4+1/3x4x5+.1/98x99x100=要有中间过程
1/1x2x3+1/2x3x4.1/98x99x100拜托了各位
1/1X2X3+1/2X3x4+…+1/48X49X50
1X2X3+2X3X4+.+n(n+1)(n+2)
1x2x3+2x3x4+.+nx(n+1)(n+2)=?
1x2x3+2x3x4+.+n(n+1)(n+2)=?
求和1x2x3+2x3x4+...+n(n+1)(n+2)
1x2x3+2x3x4+…+n(n+1)
1x2x3+2x3x4+3x4x5+…+8x9x10
1x2x3+2x3x4+3x4x5+.+10x11x12
1x2x3+2x3x4+3x4x5+...+7x8x9=,