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1/6+1/12+1/20+1/30+1/41简便计算
人气:320 ℃ 时间:2020-05-13 16:16:22
解答
1/6+1/12+1/20+1/30+1/42
=1/2-1/3+1/3-1/4+1/5-1/6+1/6-1/7
=1/2-1/7
=5/14
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