名校
解题方法
1 . 经过坐标原点
且互相垂直的两条直线
和
与圆
相交于
四点,有下列结论:
①弦
长度的最小值为
;
②线段
长度的最大值为
;
③四边形
面积的取值范围为
.
其中所有正确结论的序号为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/701f3b0e2bedfe5195443459072d798e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02739371fabe090f3686cb8ec4046c12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea6dec3ef34312fabcb98921ca46e60f.png)
①弦
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c19a9e99072c37a49b4eb21ae61bef.png)
②线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bc098576babe079734625742950fe5a.png)
③四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d01ec13e456c3fd5cb349edef516efeb.png)
其中所有正确结论的序号为
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