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四升五年级上册数学《小数乘法》简便计算例题解析
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2025-07-16
3.57 MB

四升五年级上册数学《小数乘法》简便计算例题解析


简介：
四升五年级上册数学《小数乘法》简便计算 一、乘法交换律 0.25×8.5×4 =0.25×4×8.5 =1×8.5 =8.5 12.5×0.96×0.8 =12.5×0.8×0.96 =10×0.96 =9.6 0.5×0.34×0.6 =0.5×0.6×0.34 =0.3×0.34 =0.102 二、乘法结合律 4.36×12.5×8 =4.36×(12.5×8) =4.36×100 =436 0.95×0.25×4 =0.95×(0.25×4) =0.95×1 =0.95 0.75×50×0.4 =0.75×(50×0.4) =0.75×20 =15 三、拆数+乘法结合律 0.125×8.8 =0.125×8×1.1 =1×1.1 =1.1 0.25×0.28 =0.25×4×0.07 =1×0.07 =0.07 0.125×3.2×2.5 =(0.125×8)×(0.4×2.5) =1×1 =1