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

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

第1个回答  2009-04-28
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本回答被提问者采纳
第2个回答  2009-04-27
你这个是(1/2)*3*4还是1/(2*3*4)啊?