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13. 一般锥 面

13. 一般锥 面. z. 0. y. x. 方程 F ( x,y,z ) = 0 是 n 次齐次的：. t 是任意数. F ( x,y,z ) = 0. 的图形是以原点为顶点的锥面；. n 次齐次方程. 准线. 顶点. F ( x,y,z ) = 0. 反之，以原点为顶点的锥面的方程是. n 次齐次方程. 锥面是直纹面.

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13. 一般锥 面

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  1. 13.一般锥面 z 0 y x 方程 F(x,y,z)= 0是 n次齐次的： t是任意数 F(x,y,z)= 0 的图形是以原点为顶点的锥面； n次齐次方程 准线 顶点 F(x,y,z)= 0. 反之，以原点为顶点的锥面的方程是 n次齐次方程 锥面是直纹面

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