五年级上册数学小数乘法简便运算
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简介
五年级上册数学小数乘法之简便运算 （八大考点题型） 考点题型一：整数乘法运算律推广到小数 乘法交换律/乘法分配律/裂差/乘法分配律 2.5×0.32×0.4 =2.5×0.4×0.32 =1×0.32 =0.32 5.7×1.8+4.3×1.8 =1.8×(5.7+4.3) =1.8×10 =18 3.9×9.8 =3.9×(10-0.2) =3.9×10-3.9×0.2 =39-0.78 =38.22 1.25×(8+0.8) =1.25×8+1.25×0.8 =10+1 =11 考点题型二：乘法分配律逆用 a×c+b×c=(a+b)×c 7.8×0.36+0.64×7.8 =7.8×(0.36+0.64) =7.8×1 =7.8 63.2×39-63.2×29 =63.2×(39-29) =63.2×10 =632
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