tolong jawab ya beserta caranya

8. 15km
3.A∪B={1,2,3,4,5,6}
   A∩B={3}
2. 12/1 X 3/2 =18
5. 5a(3a²-3a+1)
15a³-15a²+5a
1. 20+(115:5)-12
20+23-12
=31
6. 7-4/7+4×66
3/11×66
3/1×6=3×6
=18