Question

resolva as divisões abaixo:
15/3 : 9/4 =
21/4 : 3/4 =
7/4 : 8/10 =

Answer 1

15/3 : 9/4 =  15/3 * 4/9 = 60/27 = 20/9
21/4 : 3/4 = 21/4 * 4/3 = 84/12 =  7
7/4 : 8/10  = 7/4 * 10/8 = 70/32 = 35/16