Решите систему уравнений 1/x-1/y=1/12 5X-y=18

1/x - 1/y = 1/12    (x ≠ 0; y ≠ 0) 5x - y = 18    (y - x)/xy = 1/12 5x - y = 18 xy = 12(y - x) 5x - y = 18 xy = 12(y - x) y = 5x - 18 x (5x - 18) = 12(5x - 18 - x) 5x^2 - 18x = 12(4x - 18) 5x^2 - 18x = 48x - 216 5x^2 - 18x - 48x + 216 = 0  5x^2 - 66x + 216 = 0  D = 4356 - 4320 = 36 = 6^2 x1 = ( 66 + 6)/10 = 7,2 x2 = ( 66 - 6 )/10 = 6  x1 = 7,2 y1 = 5x1 - 18 = 18 x2 = 6 y2 = 5x2 - 18 = 12 Ответ ( 7,2 ; 18) ( 6; 12)