1+1/3-7/12+9/20-11/30+13/42
问题描述:
1+1/3-7/12+9/20-11/30+13/42
答
1+1/3-7/12+9/20-11/30+13/42
=1+1/3-(1/3+1/4)+(1/4+1/5)-(1/5+1/6)+(1/6+1/7)
=1+1/7
=8/7