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[几何] 一个四次曲线题

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1+1=? posted 2025-4-18 14:00 |Read mode
Last edited by hbghlyj 2025-5-20 00:24曲线$E:(x+y-4)^2(2x+1)=9x^2(2y-x^2)$上有两点$A,B$,点$P(-1,-4)$,若$k_{PA}+k_{PB}=-2$,求证线段$AB$过定点.

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original poster 1+1=? posted 2025-4-18 14:10 from mobile
Last edited by 1+1=? 2025-5-20 09:58此题没有意义
1+1=2吗?

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original poster 1+1=? posted 2025-4-18 18:03 from mobile
此曲线有射影生成,过p点有两条定直线调和分割pa,pb
可以退化成有节点的三次曲线
1+1=2吗?

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