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五年级数学上册期中必考《小数简便运算》汇总
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2022-11-02
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五年级数学上册期中必考《小数简便运算》汇总


简介：
1、乘法交换律和结合律 1.78×2.5×4 1.25×4.3×0.8 0.25×4.78×4 =1.78×10 =1.25×0.8×4.3 =0.25×4×4.78 =17.8 =1×4.3 =1×4.78 =4.3 =4.78 1.25×32×0.25 7.5×16 1.25×16×2.5 =1.25×8×4×0.25 =7.5×4×4 =1.25×8×2×2.5 =10×1 =30×4 =10×5 =10 =120 =50 2、乘法分配律 25×4.4 8.8×1.25 3.6×0.25 =25×(4+0.4) =(8+0.8)×1.25 =4×0.9×0.25 =25×4+25×0.4 =8×1.25+0.8×1.25 =4×0.25×0.9