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Z x2. X^2+Y^2=Z^2. Параболоид x^2 - y^2 = 2z. Параболоид z x 2+y 2. Конус x^2+y^2=z^2.
X^2+Y^2=Z^2. Параболоид x^2 - y^2 = 2z. Параболоид z x 2+y 2. Конус x^2+y^2=z^2.

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