(x+2 7\3):3 7\2=5\4 (Y-15\2):1 6\5=2 5\1 (1 4\1+x):1 5\4-3\1=2\1

1) (x + 2 7/3) : 3 7/2 = 5/4;

(x + (2 * 3 + 7)/3) : (3 * 2 + 7)/2 = 5/4;

(x + 13/3) : 13/2 = 5/4;

x + 13/3 = 5/4 * 13/2;

х = 5/4 * 13/2 - 13/3 = 65/8 - 13/3 = 195/24 - 104/24 = 91/24;

Ответ: х = 91/24.

2) (Y - 15/2) : 1 6/5 = 2 5/1;

(Y - 15/2) : (1 * 5 + 6)/5 = 2 + 5;

(Y - 15/2) : 11/5 = 7;

Y - 15/2 = 7 * 11/5;

Y = 15/2 + 77/5 = 75/10 + 154/10 = 229/10 = 22,9;

Ответ: Y = 22,9.

3) (1 4/1 + x) : 1 5/4 - 3/1 = 2/1;

(1 + 4 + x) : (1 * 4 + 5)/4 - 3 = 2;

(5 + x) : 9/4 = 2 + 3;

5 + x = 5 * 9/4;

х = 45/4 - 5 = 45/4 - 20/4 = 25/4.

Ответ: х = 25/4.