1/8+1/24+1/48+1/80
问题描述:
1/8+1/24+1/48+1/80
答
1/8+1/24+1/48+1/80
=1/2×(1/2-1/4+1/4-1/6+1/6-1/8+1/8-1/10)
=1/2×(1/2-1/10)
=1/2×4/10
=1/5