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1/12+1/20+1/30+1/42+1/56=?
人气:121 ℃ 时间:2020-04-04 10:26:56
解答
1/12+1/20+1/30+1/42+1/56
=1/3-14+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8
=1/3-1/8
=5/24
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