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数学
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某工厂有一堆煤,用去3分之2,正好是4分之5吨.这对没有多少吨
不要方程,
人气:363 ℃ 时间:2020-01-29 20:28:41
解答
(5/4) / (1-2/3) = (5/4) / (1/3) = 15/4 吨
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