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12.5x0.25x0.8简便计算

有简便运算,简便运算就是先算能凑整的,那么看到25就想到4,看到125就想到8,因为乘积是100的倍数.(12.5*0.8)*(0.25*40)=10*10=100请采纳谢谢

12.5x0.25x0.8x40 =12.5x0.8x40x0.25 =1.25x8x40x1/4 =10x10 =100

=0.25x12.5x4x0.8=(0.25x4)x(12.5x0.8)=1x10=10

12.5X0.64X0.25=(12.5X4)X(0.25X4)X0.04 =50X1X0.04=2

(0.25X12.5)X(4X0.8) =0.25*4*12.5*0.8 =1*10 =10

12.5x0.25x3.2=(12.5*0.8)x(0.25x4)=10*1=10

12.5x0.25x3.2 =12.5x0.25x0.4x8 =(12.5x8)x(0.25x0.4) =100x0.1 =10 12.5x4.5+4.5x12.5+12.5 =12.5x(4.5+4.5+1) =12.5x10 =125 所谓的简便算法,就是凑成整十整百的数.如25与4,125与8等然后把数字拆开来计算

12.5*8.43*0.8=8.43*(12.5*0.8)=8.43*10=84.3

12.5x0.25x3.2=12.5x8 * 0.25x0.4=100*0.1=10

=0.8*12.5*0.25 =10*0.25 =2.5

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