1-1/4+1/20+1/30+1/42+1/56
问题描述:
1-1/4+1/20+1/30+1/42+1/56
简便计算哦
答
1-1/4+(1/4-1/5)+(1/5-1/6)+(1/6-1/7)+(1/7-1/8)
=1-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8
=1-1/8
=7/8