0.56×40.5+0.44×59.5可不可以巧算 - 知识问答

0.56×40.5+0.44×59.5可不可以巧算

1个回答

0.56×40.5+0.44×59.5
=0.56*40.5+0.44*(40*5+19)
=0.56*40.5+0.44*40.5+0.44*19
=40.5*(0.56+0.44)+8.36
=40.5+8.36
=48.86

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