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五年级上册数学《小数乘法简便运算》7类
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2025-07-04
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五年级上册数学《小数乘法简便运算》7类


简介：
一、乘法交换律a×b×c=b×a×c 0.25×8.5×4  =0.25×4×8.5 =1×8.5  =8.5  12.5×0.96×0.8   =12.5×0.8×0.96   =10×0.96   =9.6  0.5×0.34×0.6 =0.5×0.6×0.34 =0.3×0.34 =0.102 二、乘法结合律a×b×c=a×(b×c) 4.36×12.5×8  =4.36×(12.5×8)  =4.36×100      =436  0.95×0.25×4    =0.95×(0.25×4)   =0.95×1 =0.95   0.75×50×0.4 =0.75×(50×0.4) =0.75×20 =15 三、乘法分配律 (a+b)×c=a×c+b×c或【(a-b)×c=a×c-b×c】 (1.25-0.125)×8 =1.25×8-0.125×8 =10-1  =9  (125+2.5)×0.8     =125×0.8+2.5×0.8 =1+1   =2  3.72×3.5+6.28×3.5 =3.5×(3.5+6.28) =3.5×10  =35