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1/30+1/42+1/56+1/72+1/90=简便计算
人气:294 ℃ 时间:2019-12-18 01:03:22
解答
1/30+1/42+1/56+1/72+1/90
=1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9+1/9-1/10
=1/5-1/10
=1/10
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