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脱式计算.0.8×(12.5+

(1)0.8×(12.5+1.25)=0.8×12.5+0.8×1.25=10+1=11;(2)7.75×[20÷(3.24-3.04)=7.75×(20÷0.2)=7.75×100=775;(3)4.05÷0.81+2.4=5+2.4=7.4.

(1)0.8×(12.5+1.25)=0.8×12.5+0.8×1.25=10+1=11;(2)7.75×[20÷(3.24-3.04)=7.75×(20÷0.2)=7.75×100=775;(3)4.05÷0.81+2.4=5+2.4=7.4.

1

看到8和 125就要想到8×125=1000 =14.6×10 =146

原式 =(12.5x0.8)x(0.5x0.4) =10x0.2 =2

(1)0.8×4×2.5×12.5 =(0.8×12.5)×(4×2.5)=10×10=100; (2)4.3×7+4.3×2+4.3=4.3×(7+2+1)=4.3×10=43.

应该是 8.8×12.5 =11×0.8×12.5 =11×(0.8×12.5) =11×10 =110

4×0.8×0.25×12.5 =4×0.25×(0.8×12.5) =1×10 =10

12.5×7.8×0.8 =12.5×0.8×7.8 =10×7.8 =78

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