17.5×0.25+12.5÷4的简便方法
人气：435 ℃ 时间：2020-02-03 00:04:28
解答
17.5×0.25+12.5÷4
=17.5×0.25+12.5×1/4
=17.5×0.25+12.5×0.25
=(17.5+12.5)×0.25
=30×0.25
=7.5
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