(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) =
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![(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) =](/uploads/image/z/612472-40-2.jpg?t=%281%2F3%29-%281%2F12%29-%281%2F20%29-%281%2F30%29-%281%2F42%29+%3D+%E7%AD%89%E4%BA%8E%E5%A4%9A%E5%B0%91+%E5%87%8F%E5%8E%BB%E4%BA%8C%E5%8D%81%E5%88%86%E4%B9%8B%E4%B8%80%E5%87%8F%E5%8E%BB%E4%B8%89%E5%8D%81%E5%88%86%E4%B9%8B%E4%B8%80%E5%87%8F%E5%8E%BB%E5%9B%9B%E5%8D%81%E4%BA%8C%E5%88%86%E4%B9%8B%E4%B8%80%E5%B0%B1%E6%98%AF%281%2F3%29-%281%2F12%29-%281%2F20%29-%281%2F30%29-%281%2F42%29+%3D)
(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) =
(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) =
(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) =
(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
1/4
小学生同学请你好好学习,不要问这么简单的东西.
1/12 = 1/3-1/4
1/20 = 1/4-1/5
1/30 = 1/5-1/6
所以原式= 1/3-(1/3-1/4) - (1/4-1/5)-(1/5-1/6)-(1/6-1/7) = 1/7