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[几何] 椭圆中直线与圆相切的相关问题

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lemondian posted 2022-6-24 11:15 |Read mode
Last edited by lemondian 2022-6-24 11:22已知点$P(x_0,y_0)$在椭圆$C:\dfrac{x^2}{a^2}+\dfrac{y^2}{b^2}=1$上,能否在椭圆上找到两个点$M,N$,满足:${\triangle PMN}$的三边所在直线的斜率成等差数列,且边$PM$与边$PN$所在直线均与圆$(x-mx_0)^2+(y-y_0)^2=r^2(r>0,m\ne1)$相切。如果存在,求出相应的$r$值;如果不存在,请说明理由。

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色k posted 2022-6-24 12:19 from mobile
原题?

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original poster lemondian posted 2022-6-24 12:57
62401.jpg

这是原题,我想能不能推广一下?

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