1/1x2x3+1/2x3x4+1/3x4x5

来源：学生作业帮编辑：作业帮分类：数学作业时间：2024/05/02 06:55:20

1/1x2x3+1/2x3x4+1/3x4x5
1/2x3x4 + 1/3x4x5 + 1/4x5x6 +……+1/99x100x101
是 1/（2x3x4）

解1/(1+2+3)+1/(2+3+4)+1/(3+4+5)……+1/(99+100+101)
=1/6+1/9+1/12+1/15.+1/300
=1/3*(1/2+1/3.+1/99+1/100)
=1/3*4.18737751763961
=1.39579250587987

1/1x2x3+1/2x3x4+1/3x4x5 1x2X3+2x3X4+3x4X5+…+7X8X9=? 1x2x3+2x3x4+3x4x5+…+8x9x10 1x2x3+2x3x4+3x4x5+...+7x8x9=, 1x2x3+2x3x4+3x4x5+.+10x11x12 1/1x2x3+1/2x3x4+1/3x4x5+1/4x5x6+.+1/48x49x50= 1/1x2x3+1/2x3x4+1/3x4x5+.+1/11x12x13= 1/1x2x3+1/2x3x4+1/3x4x5+.+1/9x10x11= 请1/1x2x3+1/2x3x4+1/3x4x5+1/4x5x6= 1/(1x2x3)+1/(2x3x4)+1/(3x4x5)+.1/(20x21x22)=? 1/1x2x3+1/2x3x4+1/3x4x5+.1/98x99x100= 1x2x3+2x3x4+3x4x5+4x5x6+...+n(n+1)(n+2)=