1又1/3-7/12+9/20-11/30+13/42-15/56
=（1+1/3)-(1/3+1/4)+(1/4+1/5)-(1/5+1/6)+(1/6+1/7)-(1/7+1/8)
=1-1/8
=7/8
1又1/3+7/12+9/20-11/30+13/42-15/56=?
1又1/3+7/12+9/20-11/30+13/42-15/56=?
数学人气：665 ℃时间：2019-09-17 05:23:15
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