4/9-1/6=

4/9 – 1/6
= 24/54 – 9/54
= 15/54

7/10 – 11/20
= 14/20 – 11/20
= 3/20

5/6 – 7/10
= 25/30 – 21/30
= 4/30

3/3 – 4/9
= 9/9 – 4/9
= 5/9

semoga membantu ^_^