题目内容
(2010?合水县)简算:22.5×0.39+7.75×3.9.
分析:依据积不变性质,化22.5×0.39为2.25×3.9,再运用乘法分配律解答.
解答:解:22.5×0.39+7.75×3.9,
=2.25×3.9+7.75×3.9,
=(2.25+7.75)×3.9,
=10×3.9,
=39.
=2.25×3.9+7.75×3.9,
=(2.25+7.75)×3.9,
=10×3.9,
=39.
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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