Решите уравнения: (х-1/9) + 1/3=7/18 2) 24,29 / (-х) + 9,9=5,6 3) (6 7/5-у) + 4 9/20=11 5/12 4) - (-х) - 7 5/6=3-5/6

1) (х - 1/9) + 1/3 = 7/18;

х = 7/18 - 1/3 + 1/9 = 7/18 - 6/18 + 2/18 = (7 - 6 + 2) / 18 = 3/18 = 1/6;

2) 24,29 / (-х) + 9,9 = 5,6;

24,29 / (-х) = 5,6 - 9,9;

24,29/х = 4,3;

х = 24,29/4,3 = 2429/430.

3) (6 7/5 - у) + 4 9/20 = 11 5/12;

(6 * 5 + 7) / 5 - у + (4 * 20 + 9) / 20 = (11 * 12 + 5) / 12;

37/5 - у + 89/20 = 137/12;

у = 37/5 + 89/20 - 137/12 = 444/60 + 267/60 - 685/60 = (444 + 267 - 685) / 60 = 26/60 = 13/30;

4) - (-х) - 7 5/6 = 3 - 5/6;

х = 3 - 5/6 + 7 5/6 = 3 + 7 = 10.