1) x : 10/13 = 1 19/20 2) x: 11/12 = 1 4/11
1) 1 19/20 = 39/20 39/20 • 10/13 = 3/2 = 1 1/2 Х= 1 1/2 2) 1 4/11 = 48/11 48/11 • 11/12 = 4 Х= 4