mohon bantuannya.....semua

1. 7/4 + 1/5
1 3/4 + 1/5
1 15/20 + 4/20
1 19/20
2. 7/4 - 1/5
1 3/4 - 1/5
1 15/20 - 4/20
1 11/20
3. 1 5/9 - 1/3
1 5/9 - 3/9
1 2/9
4. -16 + (-24) : 6 - 5 × (-3)
-16 + (-4) - (-15)
-20 + 15
- 5