问题: 小学五年级数学题
简便计算:
41.2×8.1 + 11×1.25 + 53.7×1.9
解答:
41.2×8.1+11×1.25+53.7×1.9
=41.2×(10-1.9)+11×1.25+53.7×1.9
=412-41.2×1.9+53.7×1.9+11×1.25
=412+12.5×1.9+11×1.25
=412+1.25×19+1.25×11
=412+1.25×30
=412+37.5
=449.5
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