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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

12.5X(8+0.8) =12.5×8+12.5×0.8 =100+10 =110

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

(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.

原式 =(12.5x0.8)x(0.5x0.4) =10x0.2 =2

12.5×8÷12.5×8 =(12.5÷12.5)x(8x8) =1x64 =64

=(0.96-0.5)*4 =0.46*4 =1.84

1.46×5+12.8÷0.4×7.5 =1.46×5+3.2×7.5 =1.46x5+3.2x1.5x5 =1.46x5+4.8x5 =(1.46+4.8)x5 =6.26x5 =31.3 希望帮到你 望采纳 谢谢 加油

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