四年级下册数学小数简便计算常题型分类
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简介
1、乘法交换律和结合律 1.78×2.5×4 =1.78×10 =17.8 1.25×4.3×0.8 =1.25×0.8×4.3 =1×4.3 =4.3 0.25×4.78×4 =0.25×4×4.78 =1×4.78 =4.7 1.25×32×0.25 =1.25×8×4×0.25 =10×1 =10 7.5×16 =7.5×4×4 =30×4 =120 1.25×16×2.5 =1.25×8×2×2.5 =10×5 =50
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