题目内容
简便计算。
41.2×8.1+11×1.25+53.7×1.9
41.2×8.1+11×1.25+53.7×1.9
原式= 41.2×8.1+11×1.25+(41.2+12.5)×1.9
= 41.2×(8.1+1.9)+12.5×(1.1+1.9)
= 412+37.5
= 449.5
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题目内容
原式= 41.2×8.1+11×1.25+(41.2+12.5)×1.9
= 41.2×(8.1+1.9)+12.5×(1.1+1.9)
= 412+37.5
= 449.5