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[几何] 包络为抛物线直线在角的两边上截下的线段之和为定值

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hbghlyj posted 2021-2-23 21:43 |Read mode

Last edited by hbghlyj 2023-9-8 12:14D,E在线段AB,AC上,BD+CE=BC,求证:直线DE与定抛物线相切.
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抛物线,线段之和.ggb (19.85 KB, Downloads: 3020)
在这帖的引理中用到.

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kuing posted 2021-2-23 22:06

就是二次贝塞尔曲线？

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original poster hbghlyj posted 2021-2-23 22:14

回复 2# kuing
谢谢.我懂了.

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