五年级上册数学《小数乘法》简便运算
-
简介
1.乘法交换律、结合律 2.5×8.7×0.4 =2.5×0.4×8.7 =(2.5×0.4)×8.7 =1×8.7 =8.7 0.25×6.8×0.4 =0.25×0.4×6.8 =0.1×6.8 =0.68 2.5×1.75×8 =2.5×8×1.75 =20×1.75 =35 0.5×3.38×0.2 =0.5×0.2×3.38 =0.1×3.38 =0.338 0.4×68.9×0.25 =0.4×0.25×68.9 =0.1×68.9 =6.89 1.25×0.4×0.25×8 =1.25×8×0.4×0.25 =(1.25×8)×(0.4×0.25) =10×0.1
本年级热门下载
同类热门下载