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
编辑:chaxungu时间:2026-04-27 13:34:02分类:小学数学题库
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