2можно не делать там не видно
большое кто ​

1)

3/4 : 2/5 = 3/4 * 5/2 = 15/8 = 1 7/8

4 2/7 : 11/10 = 30/7 * 10/11 = 300/77 = 3 69/77

3)

(4 1/3 - (2/5)^2 +3 1/75): 4/75 = (13/3 - 4/25 + 226/75) * 75/4=(325/75 - 12/75 +226/75) * 75/4 = 539/75 * 75/4 = 134 3/4

4)

((3 1/2 + (2/3)^2) *х +3/18 = 5/18

(7/2 +4/9)*х = 5/18 - 3/18

(63/18+ 8/18)*х =1/9

71/18 *х =1/9

х = 1/9 *18/71

х = 2/71