名校
1 . 下列说法中错误的序号是: _________
①已知
恒成立,若
为真命题,则实数
的最大值为2;
②已知三点
共线,则
的最小值为11;
③已知
是椭圆
的为两个焦点,点
在椭圆
上,则使三角形
为直角三角形的点
个数4 个;
④在圆
内,过点
有
条弦的长度成等差数列,最小弦长为数列的首项
,最大弦长为
,若公差
那么
的取值集合为
.
①已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42c2b26b6579f1dd9875d2f24e943f45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ffc1bb9d53a27d484396ad74d6a26e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
②已知三点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/862bc1c9704866110be9e687ed5324be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c889f50235620e5dbe7e9eeb8480a922.png)
③已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d2a97987f71835f519b462f5b8f5957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b3cfb07fcf2c1bf055d517631d80b7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd5a8e1bc9748e5519dcd9981b7eb251.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
④在圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8488cc02b3cd29f714dc01b78ae70bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82cc839d42762fb509859035b11dae8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e03019ae02ab0bf6d2b9e1a1463b48e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/425bb20228455bae806d83e90c53da14.png)
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