Tolong,Bantu ini dong :D

5. 3/9 = 2/x (x = GF)
1/3 = 2/x
x = 6
6. 2cm/4m = x cm/8m
2/400 = x/800
200x = 800
x = 800/200
x = 4cm
7. x/40 = 5/10
40 = 2x
40/2 = x
20 = x
8. 1,5/x = 2/12
1,5/x = 1/6
9 = x