问个问题

wda43779

问题出处：http://www.dynamicgeometry.com/Documents/GSP4-101Projects.pdf
原文：25.Super-challenge: Given a triangle and an arbitrary point inside it, construct an
ellipse that has that point as one of its foci and that is inscribed in the triangle.
译文：25.超级挑战：给定一个三角形和三角形内部的任意一点，构造一个椭圆使那个点是椭圆的一个焦点并使那个椭圆内切于原三角形。（人工翻译）

做了好久，竟然没做出来，谁做下