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0.25×4+0点八的和的简便运算

0.25乘括号4+0.8括号简便计算 =0.25x4+0.25x0.8 =1+0.2 =1.2

解:根据分配律的运用, 原式=0.25x4x8+0.125x8x4 =1x8+1x4 =8+4 =12

0.8×0.25×0.4×12.5的简便运算写法如下: 8x0.25x0.4x12.5 =(8x12.5) x (0.4x0.25) =100x0.1 =10 分析:此题主要根据乘法交换律及结合律计算。当看到这类题型,先把小数当成整数来看,遇到25首先想到4,遇到125首先想到8。还要注意运算顺序和运算...

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0.32×0.25 =0.08×4×0.25 =0.08×1 =0.08 0.08÷4 =(0.04+0.04)÷4 =0.01+0.01 =0.02 扩展资料: 乘法: 1)乘法交换律:a*b=b*a 2)乘法结合律:a*b*c=(a*b)*c=a*(b*c) 3)乘法分配律:(a+b)*c=a*c+b*c;(a-b)*c=a*c-b*c 除法: 1)商不变的...

三点8×0点四五+0点三八×4点2+0点038×13怎么验算用简便方法验算 3.8×0.45+0.38×4.2+0.038×13 =3.8×0.45+3.8×0.42+3.8×0.13 =3.8×(0.45+0.42+0.13) =3.8×1 =3.8.

=7.5×(0.4×25)×1.8 =7.5×(10×1.8) =7.5×18 =7.5×20-7.5×2 =150-15 =135

列式计算为 8-4.2×0.5+0.63 =8-2.1+0.63 =5.9+0.63 =6.53 所以原式的计算结果为6.53

0.175÷0.25÷0.4 =0.175÷(0.25x0.4) =0.175÷(0.1) =1.75

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