The problem of attaining the tangent equation of a certain point on a quadratic curve is basically solved in plane analytical geometry.
平面解析几何对“求过二次曲线外的点所引曲线切线的方程”的问题，未给出一般的方法和公式。
The teaching of plane analytical geometry is short of the suitable courseware resources in practice.
适合学校实际平面解析几何课堂教学的课件资源匮乏。
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