Răspuns:
Explicație pas cu pas:
1. 2/9 : 13/9 : 7/5=
=2/9 x 9/13 x 5/7 =
= 10/91
2. scriu direct
8/7 x 7/4 x 6/19
2 x 6/19
12/19
2/9 : 13/9 : 7/5 = 2/9*9/13 : 7/5 = 2/13 : 7/5 = 2/13*5/7 = 10/91
________
8/7 : 4/7 : 19/6 = 8/7*7/4 : 19/6 = 2 : 19/6 = 2*6/19 = 12/19
