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1.25x2.5x0.32用简便方式法计算怎么做

1.25x2.5x0.32=1.25x2.5x(8x0.4) =1.25x8x(2.5x0.4) =1x1 =1

1.25X2.5X0.32 =(1.25X0.8)X(2.5X0.4) =1X1 =1 9.2X1.25 =10X1.25-0.8X1.25 =12.5-1 =11.5

=0.04×8×2.5×1.25 =0.04×2.5×8×1.25 =0.1×10 =1

如下

0.32x8×1.25 =0.32x(8×1.25) =0.32*10 =3.2

1.25x0.32x2.5+2.5 =1.25x0.8x0.4x2.5+2.5 =1.25x0.8x(0.4x2.5)+2.5 =1+2.5 =3.5

2.5×0.32×1.25 = 2.5×1.25×0.4×0.8 =(2.5×0.4)×(1.25×0.8) =1×1 =1 在这里运用的是乘法结合律。乘法结合律也是做简便运算的一种方法,用字母表示为(a×b)×c=a×(b×c),它的定义(方法)是:三个数相乘,先把前两个数相乘,再和第三个数相乘;或先...

1.25x0.32x2.5 +2.5简便计算 1.25x0.32x2.5 +2.5 =2.5*(1.25*0.32+1) =2.5*1.4 =3.5

解:根据拆分法和结合律的运用, 原式=1.25x(0.8x0.4)x0.25 =(1.25x0.8)x(0.4x0.25) =1x0.1 =0.1

简便计算 25×0.32×1.25 =25x0.4x0.8x1.25 =(25x0.4)x(0.8x1.25) =10x1 =10

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