名校
解题方法
1 . 在xoy坐标平面内,已知椭圆
的左、右焦点分别为
、
,直线
与
相交于A、B两点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/5c575c67-f6cd-498c-a8b6-80a32626836a.png?resizew=189)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/1b3bfeac-39dd-441b-9ade-9f03b2f51281.png?resizew=187)
(1)记d为A到直线
的距离,当
变化时,求证:
为定值;
(2)当
时,求
的值;
(3)过B作BM⊥x轴,垂足为M,OM的中点为N,延长AN交
于另一点P,记直线PB的斜率为
,当
取何值时,
有最小值?并求出此最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22dfefe29b9f7643bf7099ee21345afc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdaf3914f625c7535a8ddc019ff4cba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bcd8ee2d8367c167d6ae0abc741b6b8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/5c575c67-f6cd-498c-a8b6-80a32626836a.png?resizew=189)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/1b3bfeac-39dd-441b-9ade-9f03b2f51281.png?resizew=187)
(1)记d为A到直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1531b008d36fbc27fb940a8efe239c0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6defc43285a40f7ccb74c1cc04265eba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1f79c04df9051331559b1bbf20aa007.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30892784d3f0a6ef780c9fa42796df2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c600e7bc9ca4f34bd849c27efdf33b7.png)
(3)过B作BM⊥x轴,垂足为M,OM的中点为N,延长AN交
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bcd8ee2d8367c167d6ae0abc741b6b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423b7ae39db552e60ee8b1d27312306f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6defc43285a40f7ccb74c1cc04265eba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b3fbcd952073f38340769b8fbca5b23.png)
您最近一年使用:0次
2022-12-15更新
|
783次组卷
|
2卷引用:湖北省襄阳市第四中学2022-2023学年高二上学期第三次月考数学试题
解题方法
2 . 已知
,直线
过
且与
交于
两点,过点
作直线
的平行线交
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/1/f531e8b0-acad-41b3-8d2c-c75827cf8868.png?resizew=135)
(1)求证:
为定值,并求点
的轨迹
的方程;
(2)设动直线
与
相切于点
,且与直线
交于点
,在
轴上是否存在定点
,使得以
为直径的圆恒过定点
?若存在,求出
的坐标;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0fda86cce82b989e89fac266ea660a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c850811ba59a05e945a665196539a048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c20d0b44025a639ce3a92d639dae587.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39acab3cfb59bfc9591371721ab01d93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/1/f531e8b0-acad-41b3-8d2c-c75827cf8868.png?resizew=135)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13b2b09f9c6800d238e8d34018a01fb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
(2)设动直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e23ce99834b48c69a954e96f84755105.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55aa0a20848c37c1892c567b2315e04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10c64cc584dde9a132ab54c6981cce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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