Вправи 401 - 467 » 415 (2)

2) x–2 + y–2 = 2/x^2 – 3/y^2 . 1/x^2 + 1/y^2 = 2/x^2 – 3/y^2 . (y^2+ x^2)/(x^2 y^2 ) = (〖2y〗^2- 〖3x〗^2)/(x^2 y^2 ) |• x2y2; y2 + x2 = 2y2 – 3x2; x2 + 3x2 = 2y2 – y2; 4x2 = y2 |: 4y2; (x/y)2 = 1/4; (x/y)2 = 0,25.