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 = 1/125x - y = 18xy = 12(y - x)5x - y = 18xy = 12(y - x)y = 5x - 18x (5x - 18) = 12(5x - 18 - x)5x^2 - 18x = 12(4x - 18)5x^2 - 18x = 48x - 2165x^2 - 18x - 48x + 216 = 0 5x^2 - 66x + 216 = 0 D = 4356 - 4320 = 36 = 6^2x1 = ( 66 + 6)/10 = 7,2x2 = ( 66 - 6 )/10 = 6 x1 = 7,2y1 = 5x1 - 18 = 18x2 = 6y2 = 5x2 - 18 = 12Ответ( 7,2 ; 18)( 6; 12)