简便计算。41.2×8.1+11×1.25+53.7×1.9-五年级数学
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
题目简介
简便计算。41.2×8.1+11×1.25+53.7×1.9-五年级数学
题目详情
41.2×8.1+11×1.25+53.7×1.9
答案
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