56.9*.47-13.5的简便算法

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56.9*.47-13.5的简便算法56.9*.47-13.5的简便算法56.9*.47-13.5的简便算法56.9*0.47-13.5=56.9*0.5-56.9*0.03-13.5=28.45-1

56.9*.47-13.5的简便算法
56.9*.47-13.5的简便算法

56.9*.47-13.5的简便算法
56.9*0.47-13.5
=56.9*0.5-56.9*0.03-13.5
=28.45-1.707-13.5
=26.743-13.5
=13.243

楼上是正解

一楼是正解