【四升五衔接】五上数学小数乘法简便计算
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简介
35.7×101-35.7 =35.7×(101-1) =35.7×100 =3570 1.25×1.2×0.8 =1.25×0.8×1.2 =1×1.2 =1.2 1.03+1.03×99 =1.03×(1+99) =1.03×100 =103 7.4×18.2+7.4×0.8+7.4 =7.4×(18.2+0.8+1) =7.4×20 =148 1.2×2.5+0.8×2.5 =(1.2+0.8)×2.5 =2×2.5 =5 0.038×5×0.6 =0.038×(5×0.6) =0.038×3 =0.114 (34.5+26.4)×2×5 =34.5×2×5+26.4×2×5 =345+264 =609 0.72×98 =0.72×(100-2) =0.72×100-0.72×2 =70.56 0.4×9.6×2.5 =0.4×2.5×9.6 =1×9.6 =9.6
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