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14/25×12+7/25×14+42/25×2 简便运算
人气:119 ℃ 时间:2020-02-15 08:46:44
解答
14/25×12+7/25×14+42/25×2
=12×14/25+7×14/25+6×14/25
=(12+7+6)×14/25
=25×14/25
=14
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