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[几何] 2015年浙江卷文科第15题 椭圆离心率

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isee posted 2021-9-19 20:32 |Read mode
2015年那时还分文理卷的,第15题是填空的最后一题:

椭圆$\frac {x^2}{a^2}+\frac{y^2}{b^2}=1$($a>b>0$)的右焦点$F\left( c,0 \right)$关于直线$y=\frac bcx$的对称点$Q$在椭圆上,则椭圆的离心率是_$\frac{\sqrt 2}2$__.

这算是漏网之鱼吧,发上来让你们玩玩,先~

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力工 posted 2021-10-13 11:17
回复 1# isee
请问这题
你发现了什么Mimi?

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original poster isee posted 2021-10-13 11:37
回复 2# 力工


    差点忘了,好像是硬算是高次方程,几何法发现Q其实与上顶点重合

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