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1.25乘0.32乘2.5加2.5(简便计算)

=1.25×0.8×0.4×2.5+2.5 =1×1+2.5 =3.5

3.2x1.25x2.5 =4x0.8x1.25x2.5 =(4x2.5)x(0.8x1.25) =10x1 =10

(4+0.4×2.5)×8×7×1.25 =(4+1)×7×8×1.25× =5×7×10 =35×10 =350

=2.5x4x0.8x1.25=10x1=10

1.25乘以0.5乘以2.5乘以6.4的简便方法 1.25乘以0.5乘以2.5乘以6.4 =(1.25*8)*(0.5*2)*(2.5*0.4) =10*1*1 =10

1.25×2.4 =(1.25×2)+(1.25×0.4) =2.5+0.5 =3

1.25*3.2=(1.25*8)*0.4=10*0.4=4 简便计算的定义: 简便计算是一种特殊的计算,它运用了运算定律与数字的基本性质,从而使计算简便,使一个很复杂的式子变得很容易计算出得数。 简便计算的公式: 加法交换律:a+b=b+a 加法结合律:(a+b)+c=a+(...

red

1.25x8x8x2.5x5=1200

3.2×4.5×1.25 =(3.2×1.25)×4.5 =4×4.5 =18

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