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
1+1/3-7/12+9/20-11/30+13/42
1+1/3-7/12+9/20-11/30+13/42
数学人气:359 ℃时间:2020-03-23 11:08:40
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