本文应用矩阵的运算，给出求二次曲面的切平面方程的一个筒单方法。

From this paper, the equations of tangent planes of a quadratic surface are obtained by matrix operations.

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求切平面方程的一般方法是先求切平面的法向量(借助偏导)，再用点法式写出切平面的方程。

The common method to quadric surface equation is to get the Normal Component first, and then write out the equation through dot method.

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这就是切平面的方程。

That's the equation of a tangent plane.

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