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1/20+1/30+1/42+1/56+1/72等于多少 简便
人气:308 ℃ 时间:2019-09-17 13:43:14
解答
1/20+1/30+1/42+1/56+1/72
=1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9
=1/4-1/9
=5/36
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