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1+1/3-7/12+9/20-11/30+13/42=
人气:404 ℃ 时间:2020-03-25 02:13:08
解答
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
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