Y 2 5x2 2x. X^2/A^2+Y^2/B^2=1. Гипербола y^2/b^2-x^2/a^2=1. X 2 A 2 Y 2 B 2 1 график. X^2+Y^2=A^2. X 2 Y 2 9 график. Х^2+Y^2=9. 9-X^2-9*Y^2 <=0. X2 + (y + 2)2 = 9. Х2+y2 / x2-y2 * x2+XY / x2+y2. X^2 + 2* X + Y^2 < 9. X2+XY формула. 7x 10y 5 4x 1/3 5x