五上数学小数乘法简便计算典型例题

五上数学小数乘法简便计算典型例题


简介:
9.8×1.2+9.8×18.8 =9.8×(1.2+18.8) =9.8×20 =196 2.5×26.8×4 =(2.5×4)×26.8 =10×26.8 =268 3.26×5.7-3.26×0.7 =3.26×(5.7-0.7) =3.26×5 =16.3 0.39×101 =0.39×(100+1) =0.39×100+0.39×1 =39+0.39 =39.39 0.25×7.05×0.4 =0.25×7.05×0.4 =0.25×0.4×7.05 =0.1×7.05 =0.705 5.1×10.3 =5.1×(10+0.3) =5.1×10+5.1×0.3 =51+1.53 =52.53 5.7×4.8+5.2×5.7 =5.7×(4.8+5.2) =5.7×10 =57 8×3.7×0.125 =(8×0.125)×3.7 =1×3.7 =3.7 0.25×9.8×40 =(0.25×40)×9.8 =10×9.8 =98