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27×46/56+27×27/28(用简便方法计算)
人气:286 ℃ 时间:2020-03-19 00:46:49
解答
27×46/56+27×27/28
=27×46/56+27×27×2/56
=27(46+27×2)/56
=27(46+54)/56
=27*100/56
=675/14
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