1/1x3+1/2x4+1/3x5+1/4x6+1/5x7+1/6x8
问题描述:
1/1x3+1/2x4+1/3x5+1/4x6+1/5x7+1/6x8
答
LZ我不知道1/1x2+1/2x3+1/3x4+1/4x65+1/5x6+1/6x7 做过没有最后=1-1/7=6/7 采用裂项来作1/2x3=1/2-1/3 1/3x4=1/3-1/4 以此类推对于这道题目是上面的进阶了1/1x3=1/2(1-1/3)1/2x4=1/2(1/2-1/4)1/3x5=1/2(...