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8*5.27*1.25的简便计算

将1.25提前先和8相乘,5.27不动,得出10,再用5.27乘以10就会得出52.7.

8x5.27*1.25 =8x1.25x5.27=10x5.27=52.7

先算8*1.25再*5.27

=8*1.25*5.27=10*5.27=52.7

8*7.13*1.25=8x1.25x7.13=10x7.13=71.3

8.08*1.25用简便计算8.08*1.25=1.25*(8+0.08)=1.25*8+1.25*0.08=10+0.01=10.01

解:采用结合律,原式=(8x5.27)x1.25=(8x1.25)x5.27=10x5.27=52.7

8.8*1.25=8*1.1*1.25=8*1.25*1.1=11

(8x3.82)x1.25=8x1.25x3.82=10x3.82=38.2

8*2.56*1.25=8*1.25*2.56=10*2.56=25.6

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