tolong jawab ya kk no 1,2,3,5 dan 6 tolong ya kak

1. 18/20=9/10=0,9
2. 4/7=40/70
3. 75/100+2/3×6/1
=3/4+4/1
=(3+16)/4
=19/4 = 4 3/4
4. x+y=270
4:5=270
270/9×4=120
270/9×5=150
Luas: 120m² dan 150m²
6. 777/1000