Выполните действия : (8/11+3/22): 5/11=? 17/36 :(7/12-5/9)=? 19/24:(3/16+5/24)=? решите уравнение: (1/4+1/5)х= 1/4/5

1) (8/11 + 3/22) : 5/11 = (16/22 + 3/22) * 11/5 = (16 + 3)/22 * 11/5 = 19/22 * 11/5 = (19 * 11)/(22 * 5) = 19/(2 * 5) = 19/10;

2) 17/36 : (7/12 - 5/9) = 17/36 : (21/36 - 20/36) = 17/36 : 1/36 = 17/36 * 36 = 17;

3) 19/24 : (3/16 + 5/24) = 19/24 : (9/48 + 10/48) = 19/24 : 19/48 = 19/24 * 48/19 = 48/24 = 2;

4) (1/4 + 1/5) * х = 1/4/5;

(5/20 + 4/20) * х = 1/20;

 9/20 * х = 1/20;

х = 1/20 * 20/9 = 1/9.

5) (2/1/12 - 1/5/6) * х = 3/4;

(1/6 - 1/30) * х = 3/4;

(5/30 - 1/30) * х = 3/4;

х = 3/4 * 30/4 = 90/16 = 45/8.