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1.25x0.32x2.5+2.5的简便方法

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

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

(2.5X0.4)X(1·25X0.8)=1

2.5x1.25x0.32 =2.5×1.25×(0.4×0.8) =(2.5×0.4)×(1.25×0.8) =1×1 =1

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

能简便的简便 1.25×0.32×2.5 =(1.25×0.8)×(0.4×2.5) =1×1 =1

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...

1.25×0.32×250最简方法做 =(1.25×8)×(0.04×250) =10×10 =100

1.25x0.32x9 =1.25×0.8×0.4×9 =(1.25×0.8)×(0.4×9) =1×3.6 =3.6

原式=1.25x8x4x2.5 =(1.25x8)x(2.5x4) =10x10 =100

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