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X2 y2 2 y x a. Z X 2+Y 2. X^2+Y^2=Z^2 фигура. Конус x^2+y^2=z^2. Цилиндр x^2+y^2=2x.
Z X 2+Y 2. X^2+Y^2=Z^2 фигура. Конус x^2+y^2=z^2. Цилиндр x^2+y^2=2x.

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