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[几何] 椭圆的内接梯形问题

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敬畏数学 posted 2016-11-24 20:57 |Read mode
Last edited by 敬畏数学 2016-11-24 21:44曲线x^2/4+y^2=1,内接梯形ABCD,AB∥CD,且该梯形的对角线交点为(1,1/2),求直线AB的斜率。
此题算量超级巨大,有没有简便方法??

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色k posted 2016-11-24 21:06
(1,2)在椭圆外,怎么可能是对角线的交点

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色k posted 2016-11-24 21:19
交点改为椭圆内任何一点都可以做,方法参见《撸题集》第 74 页题目 1.2.30.

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