Question

tính 
2/9 : 2/3 x 1/2 
1/2 x 1/3 + 1/4 
2/7 : 2/3 - 1/7 
 

Answer 1

2/9 : 2/3 x 1/2 = 2/9 x 3/2 x 1/2 = 1/6
1/2 x 1/3 + 1/4 = 1/6 + 1/4 = 5/12
2/7 : 2/3 - 1/7 = 2/7 x 3/2 - 1/7 = 3/7 - 1/7 = 2/7

Answer 2

1/6

5/12

2/7

Answer 3

6/18 x 1/2 = 6 / 36 = 1/6

1/6 + 1/4 = 4+6/24 = 10/24

6/14 - 1/7 = 6 - 2 / 14 = 3/14