1 . 思维辨析(对的写正确,错的写错误)
(1)若直线的斜率一定,则当直线过椭圆的中心时,弦长最大.( )
(2)直线
被椭圆
截得的弦长为
.( )
(3)已知椭圆
与点
,过点
可作出该椭圆的一条切线.( )
(4)直线
与椭圆
的位置关系是相交.( )
(1)若直线的斜率一定,则当直线过椭圆的中心时,弦长最大.
(2)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee7d7b57650bdcaa98fa3bad4335d9d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c82e7d9f4f7ace849e09e9adcb786b7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
(3)已知椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48da128547c4cf9745e8e4b99988a3db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbafd5f197d5fad74b6555b1547407d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(4)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fb624bcb08e2776352899fca324eeba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7aea48c44781a844b5c19191f70f61.png)
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