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Два в девятой. Х2+y2 / x2-y2 * x2+XY / x2+y2. X2 + (y + 2)2 = 9. X2+y2=5 XY=2. X^2 + 2* X + Y^2 < 9.
Х2+y2 / x2-y2 * x2+XY / x2+y2. X2 + (y + 2)2 = 9. X2+y2=5 XY=2. X^2 + 2* X + Y^2 < 9.

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