(1/3)-(1/12)-(1/20)-(1/30)-(1/42) = 等于多少 减去二十分之一减去三十分之一减去四十二分之一
就是(1/3)-(1/12)-(1/20)-(1/30)-(1/42) =
人气：401 ℃ 时间：2020-04-18 13:16:36
解答
(1/3)-(1/12)-(1/20)-(1/30)-(1/42)
=1/3 -(1/12+1/20+1/30+1/42)
=1/3-(1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7)
=1/3-(1/3-1/7)
=1/7
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