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0.8×(12.5+1.25)的简便计算

简便计算 0.8x(12.5+1.25) =0.8x12.5+0.8x1.25 =10+1 =11

乘法分配率

0.8*(12.5-1.25) =0.8*12.5-0.8*1.25 =10-1 =9

原式=12.5*8+1.25*8 = 100+10 =110

0.8×(12.5-1.25) =0.8×12.5-0.8×1.25 =10-1 =9

(1.25+1.25+4)*8 =1.25*8+1.25*8+4*8 =10+10+32 =52

12.5*8+1.25*8+0.125*8

(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.

6.4×1.25×12.5 =8×1.25×0.8×12.5 =10×10 =100

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