Пошаговое объяснение:

№1

4 1/2 : х + 1 3/4 = 3 19/28

4 1/2 : х = 3 19/28 - 1 3/4

4 1/2 : х = 3 19/28 - 1 21/28

4 1/2 : х = 2 47/28 - 1 21/28

4 1/2 : х = 1 26/28

4 1/2 : х = 1 13/14

х = 4 1/2 : 1 13/14

х = 9/2 : 27/14

х = 9/2 * 14/27

х = 1/1 * 7/3

х = 7/3

х = 2 1/3

№2

3 2/3 : (х - 2 4/15) = 3 5/13

х - 2 4/15 = 3 2/3 : 3 5/13

х - 2 4/15 = 11/3 : 44/13

х - 2 4/15 = 11/3 * 13/44

х - 2 4/15 = 1/3 * 13/4

х - 2 4/15 = 13/12

х - 2 4/15 = 1 1/12

х = 1 1/12 + 2 4/15

х = 1 5/60 + 2 16/60

х = 3 21/60

х = 3 7/20