5.4×4.6+0.54×5.4的简便算法 - 知识问答

5.4×4.6+0.54×5.4的简便算法

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5.4×4.6+0.54×5.4
=(5+0.4)×(5-0.4)+(5+0.4)×(5+0.4)/10
=25-0.16+(25+2×5×0.4+0.16)/10
=25-0.16+(25+4+0.16)/10
=25-0.16+2.9+0.016
=27.756
就这么简单哈

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