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X 0 p. X^2+Y^2=Z^2. Z X 2+Y 2. Поверхность x 2 y 2 z 2. X= -2y+1 / 2-2y.
X^2+Y^2=Z^2. Z X 2+Y 2. Поверхность x 2 y 2 z 2. X= -2y+1 / 2-2y.

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