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[几何] 圆锥曲线齐次化

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guanmo1 posted 2016-11-6 09:37 |Read mode
Last edited by hbghlyj 2025-3-22 23:23求助:圆锥曲线试题中将 $x_1, x_2$ 齐次化以后令 $\frac{x_1}{x_2}=t$ 来解的题,有就请贴上来哦,谢谢

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kuing posted 2016-11-6 11:50
Last edited by hbghlyj 2025-3-22 23:23forum.php?mod=viewthread&tid=2435

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original poster guanmo1 posted 2016-11-6 15:30
Last edited by hbghlyj 2025-3-22 23:24回复 2# kuing
即 $\ln \frac{x_1}{x_2}=\frac{2 \frac{x_1}{x_2}-2}{\frac{x_1}{x_2}+1}$ .(4)令 $t=\frac{x_1}{x_2}$ ,不妨设 $x_1<x_2, u(t)=\ln t-\frac{2 t-2}{t+1}(0<t<1)$ ,则 $u'(t)$
如图,这是一道导数题的解答过程,我是说要圆锥曲线中这种解答的题啊。

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kuing posted 2016-11-6 15:51
你看了链接中的链接里的那些题了吗?

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original poster guanmo1 posted 2016-11-6 22:09
回复 4# kuing


    这些文章都看过,不是我要的东西啊。

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