五年级上册数学 计算题专项练习
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简介
3.29+0.73-2.29+2.27 =(3.29-2.29)+(0.73+2.27) =1+3 =4(同级运算交换) 0.125×3.2×2.5 =(0.125×8)×(0.4×2.5) =1×1 =1（拆数，乘法结合律） 0.25×4÷0.25×4 =(0.25÷0.25)×(4×4) =1×16 =16(同级运算交换) 3.5×99+3.5 =3.5×(99+1) =3.5×100 =350(乘法分配律) 3.29×0.25×4 =3.29×(0.25×4) =3.29×1 =3.29（乘法结合律） 35×10.2 =35×(10+0.2) =35×10+35×0.2 =350+7 =357(拆数，乘法分配律) 3.5×9.9 =3.5×(10-0.1) =3.5×10-3.5×0.1 =34.65(拆数，乘法分配律) 3.5×101-3.5 =3.5×(101-1) =3.5×100 =350（乘法分配律）
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