(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) =
问题描述：
(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) =
答