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12.5 2.7 0.8简便运算

27解: 12.5*2.7*0.8 =(12.5*0.8)*2.7 =10*2.7 =27

12.5乘以2.7=12.5*【3-0.3】=37.5-3.75=33.75多看概念才能进步

2.7*12.5=2.7*12.5*8/8=2.7*100/8=270/8=33.75

12.5x0.7x0.8=12.5*8*0.07=100*0.07=7

12.5*8-12.5*0.8=100-10=90

27

12.5*(8-0.8)=12.5*8-12.5*0.8=100-10=902.7*4.3+5.7*2.7=2.7*(4.3+5.7)=2.7*10=270.77*99=0.77*100-0.77=77-0.77=76.23 6.18*9.9+0.618=0.618*99+0.618=0.618*(99+1)=0.618*100=61.80.25*1.25*0.8*40=(0.25*40)*(1.25*0.8)=10*1=10

12.5x75x0.8简便计算12.5x75x0.8=12.5*0.8*75=10*75=750

解:(12.5-4)0.8=12.5*0.8-4*0.8=10-3.2=6.8.

=12.5÷12.5x0.8=1x0.8=0.8

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