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零点儿四乘八乘二点五乘十二点儿五,列拖式计算怎样算更简便? 19.4乘2.5加7.5乘19点儿4,

0.48*2.5*12.5=(0.6*2.5)*(12.5*0.8)=1.5*10=1519.4*2.5+7.5*19.4=19.4*(2.5+7.5)=19.4*10=1942.44÷(2.7-2.09)*6.5=2.44÷0.61*6.5=4*6.5=26

0.4*0.08*0.2*12.5*0.25*0.5=0.4*0.25*0.08*12.5*0.2*0.5=0.1*1*0.1=0.01

0.8*0.25*0.4*12.5=0.8*12.5*(0.25*0.4)=10*0.1=1

原式=2.5x0.48=2.5x(4x0.12)=2.5x4x0.12=10x0.12=1.2或者=2.5x(0.4x1.2)=2.5x0.4x1.2=1x1.2=1.2

4*0.25*(8*12.5)

零点八乘七十二点四乘十二点五=72.4*(0.8*12.5)=72.4*10=724

=0.5*0.2*(12.5*8) =0.1*100=10

原式=1.25x4x0.48x2.5=(1.25x0.48)x(4x2.5)=(1.25x8x0.06)x10=(10x0.06)x10=0.6x10=6

=(0.8*12.5)*(0.25*0.24)=10*(0.25*4*0.06)=10*(1*0.06)=10*0.06、0.6

8/21*2点5*5/12乘零点四简便计算8/21*2点5*5/12乘零点四=8/21*5/12*(2.5*0.4)=10/63*1=10/63

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