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[几何] 椭圆证明斜率定值

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hbghlyj posted 2020-6-12 18:46 |Read mode

A，B，D是椭圆C的顶点，P是椭圆C上除顶点外的任意点，直线DP交x轴于点N直线AD交BP于点M，设BP的斜率为k，MN的斜率为m，证明2m-k为定值．

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色k posted 2020-6-12 18:53

是这个吗：forum.php?mod=viewthread&tid=3264

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facebooker posted 2020-6-12 18:54

2013江西文科

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