问题标题:
1/3×1/4+1/4×1/5+1/5×1/6……1/n×1/n+1=197/600n为多少
更新时间:2024-04-27 22:09:07
问题描述:
1/3×1/4+1/4×1/5+1/5×1/6……1/n×1/n+1=197/600n为多少
付鸣回答:
1/3×1/4+1/4×1/5+1/5×1/6……1/n×1/n+1
=1/3-1/4+1/4-1/5+……+1/n-1/(n+1)
=1/3-1/(n+1)=196/600
n=149
1/3×1/4+1/4×1/5+1/5×1/6……1/n×1/n+1=197/600n为多少