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12.7*1.2%2.7*1.2简便

12.7x1.2-2.7.x1.2=1.2*(12.7-2.7)=1.2*10=12

1.2*1.2/1.2*1.2简便运算1.2*1.2/1.2*1.2=(1.2*1.2)*(1.2÷1.2)=1.44

1.2x2.7=1.2x2+1.2x0.7=2.4+0.84=3.24

原式=12.7*(10-1)+1.2=12.7*100-12.7+1.2=1270-11.5=1258.5

8.8*2.7+2.7*1.2=(8.8+1.2)*2.7=10*2.7=27

(3.6*8.1*7.5)/(1.2*2.5*2.7)=(3*1.2*3*2.7*3*2.5)/(1.2*2.5*2.7)=(3*3*3*1.2*2.7*2.5)/(1.2*2.5*2.7)=(27*1.2*2.7*2.5)/(1.2*2.5*2.7)=27(1.2*2.7*2.5)/(1.2*2.5*2.7)=27

2.7*0.8+2.7*1.2=2.7*(0.8+1.2)=2.7*2=5.4

计算:7.2*1.2=7.2x(1+0.2)=7.2+1.44=8.64

12-2/7-5/7=12-(2/7+5/7)=12-1=111/5-1.2*(3/4-7/12 )=1/5-1.2*3/4+1.2*(7/12)=1/5-0.9+0.7=0.2+0.7-0.9=0

原式=1.2x2.7+0.8x2.2=1.2x0.5+1.2x2.2+0.8x2.2=0.6+(1.2+0.8)x2.2)=0.6+2x2.2=0.6+4.4=5供参考.

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