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4/7÷2计算

4/7÷2 =4/7×1/2 =2/7

请问这个怎么算? 2/5x3/7+4/7÷5/2 2/5x3/7+4/7÷5/2 =2/5*3/7+4/7*2/5 =2/5*(3/7+4/7) =2/5

(2-4/7÷8/7)×2/7 =(2-4/7×7/8)×2/7 =(2-1/2)×2/7 =2×2/7-1/2×2/7 =4/7-1/7 =3/7

(4/9+6/7)÷(2/9+3/7) =2x(2/9+3/7)÷(2/9+3/7) =2x1 =2

共三种不同算法,举例如下: (2×7-8)×4=24 7×8÷2-4=24

3/4÷7/8÷15/14 =3/4*8/7*14/15 =4/5 (4/9+2/15)÷2/15 =4/9*15/2+1 =10/3+1 =4又1/3 3/20÷ 0.2×2/3 =3/20*5*2/3 =1/2

4÷5/4-5/4÷4 =4*4/5-5/4*1/4 =16/5-5/16 =231/80 11/7÷[5/2-(1-10/7)] =11/7÷(5/2-1+10/7) =11/7÷41/14 =11/7*14/41 =22/41

6/7÷【(4/7-1/2)×2/5】 =6/7÷(4/7-1/2)÷2×5 =6÷7÷(8/14-7/14)÷2×5 =6÷7÷(1/14)÷2×5 =6÷7×14÷2×5 =6×(14÷7÷2)×5 =6×5 =30

(×1/2)÷4/7=2/3 两边同乘以4/7 x1/2=8/21 两边同乘以2 x=16/21

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