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4÷0.8%0.8÷4脱式计算

4÷0.8-0.8÷4 =5-0.2 =4.8

4÷0.8-0.8÷4 =40 ÷ 8 - 8 ÷ 4 ÷ 10 (这一步是思路,实际上可以不写的

4÷0.8-0.8÷4 =4×5/4-4/5×1/4 =5-1/5 =4.8

4.32×15÷12+5.1÷0.8 =64.8÷12+6.375 =5.4+6.375 =1

7.8×0.4+2.2÷5×2 =7.8x0.4+2.2x0.4 =(7.8+2.2)x0.4

1、24.6-3.98+5.4-6.02 此题利用加法交换结合律,凑整再计算。步骤如下: 24.6-

解: 7.8÷0.8*2.5 =7又4/5÷4/5 *5/2 =39/5*5/4*5/2 =39/4

先算12.5*8=100*4.36=436 15.2/0.25/4=15.2*(0.25*4)=12

1、92+92×99 解析:此题可以利用乘法结合律,将1与99结合,组成100,再与92相乘,使得运

4.25*0.8+42.5 =3.4+42.5 =45.9

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