Tolong di jawab please dan jalannya juga

1. 3/4-3/5=
15/20-12/20=3/20

2. 2-8/9=
2/1-8/9=
18/9-8/9=10/9

3. 4 3/4-3 5/12=
19/4-41/12=
57/12-41/12=
16/12=
4/3

4. 9 6/8-2 1/4-2 2/6=
78/8-9/4-14/6=
156/16-36/16-14/16=
106/16=
53/8