五年级上册数学‖小数简便运算‖期末复习
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简介
(先拆数，乘法分配律) 35×10.2 =35×(10+0.2) =35×10+35×0.2 =350+7 =357 (先拆数,乘法结合律) 0.25×0.28 =0.25×4×0.07 =(0.25×4)×0.07 =1×0.07 =0.07 (先拆数，乘法结合律) 0.125×8.8 =0.125×8×1.1 =(0.125×8)×1.1 =1×1.1 =1.1 (乘法结合律) 3.29×0.25×4 =3.29×(0.25×4) =3.29×1 =3.29 (减法交换) 7.325-3.29-3.325 =7.325-3.325-3.29 =4-3.29 =0.71 (减法的性质) 7.325-(5.325+1.7) =7.325-5.325-1.7 =2-1.7 =0.3
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