第1个回答 推荐于2017-10-15
(1+1/3)-7/12+9/20-11/30+13/42-15/56+17/72
=1+1/3-(1/3+1/4)+(1/4+1/5)-(1/5+1/6)+(1/6+1/7)-(1/7+1/8)+(1/8+1/9)
=1+1/9
=10/9本回答被提问者和网友采纳
=1+1/3-(1/3+1/4)+(1/4+1/5)-(1/5+1/6)+(1/6+1/7)-(1/7+1/8)+(1/8+1/9)
=1+1/9
=10/9本回答被提问者和网友采纳
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