五年级上册小数乘法简便计算考点
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简介
一、乘法交换律 2.5×3.8×0.4 =2.5×0.4×3.8 =1×3.8 =3.8 0.75×2.9×0.4 =0.75×0.4×2.9 =0.3×2.9 =0.87 0.25×8.3×0.4 =0.25×0.4×8.3 =0.1×8.3 =0.83 1.25×5.6×0.8 =1.25×0.8×5.6 =1×5.6 =5.6 4.8×1.25×0.8 =1.25×0.8×4.8 =1×4.8 =4.8 1.6×0.5×1.25 =1.25×1.6×0.5 =2×0.5 =1 二、乘法分配律·逆应用 3.6×4.8+6.4×4.8 =(3.6+6.4)×4.8 =10×4.8 =48 7.2×9.5-5.2×9.5 =(7.2-5.2)×9.5 =2×9.5 =19 0.85×1.6+0.15×1.6 =(0.85+0.15)×1.6 =1×1.6 =1.6 12.5×3.2-2.5×3.2 =(12.5-2.5)×3.2 =10×3.2 =32 5.8×0.7+4.2×0.7 =(5.8+4.2)×0.7 =10×0.7 =7 9.6×2.5-5.6×2.5 =(9.6-5.6)×2.5 =4×2.5 =10
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