二次曲线的切线方程可分为两类:一类是已知切点的切线方程,另一类是已知斜率的切线方程。本文想谈谈第二类切线方程的应用。我们知道,斜率为k,并且与椭圆x~2/a~2+y~2/b~2=1,双曲线x~2/a~2-y~2/b~2=1和抛物线y~2=2Px相切的切线方程分别 The tangent equation of the quadratic curve can be divided into two categories: one is the tangent equation of the known tangent point, and the other is the tangent equation of the known slope. This article would like to talk about the application of the second type of tangent equations. We know that the slope is k, and the ellipse x~2/a~2+y~2/b~2=1, the hyperbola x~2/a~2-y~2/b~2=1 and the parabola y The tangent equations for ~2=2Px tangent equations