1)15a:3 = 5a21b:7 = 3b42c:6 = 7c
2)54ab:9 = 6ab72xy:12 = 6xy51ab:3 = 17ab
3)36mm:4 = 9m45xy:15 = 3xy28xy:7 = 4xy
1)
15a:3 = 5a
21b:7 = 3b
42c:6 = 7c
2)
54ab:9 = 6ab
72xy:12 = 6xy
51ab:3 = 17ab
3)
36mm:4 = 9m
45xy:15 = 3xy
28xy:7 = 4xy