名校
解题方法
1 . 如图,圆
与
轴相切于点
,与
轴正半轴交于两点
,
(
在
的上方),且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/040afb56-475b-44ff-9f5d-90108c60bc69.png?resizew=207)
(1)求圆
的标准方程;
(2)过点
作任一条直线与圆
:
相交于
,
两点.
①求证:
为定值,并求出这个定值;
②求
的面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/077855b1492bf35aac52f358e5e093ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f371c0b1d573c06516ab1904d95ee49f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/040afb56-475b-44ff-9f5d-90108c60bc69.png?resizew=207)
(1)求圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f240cccaf24af8a796abb95cb42be52e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/195adbee8ce8ab6b3efc611aecc0582f.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc96cbcfa8d5e19732facffb936bec5c.png)
您最近一年使用:0次
2020-02-27更新
|
1634次组卷
|
6卷引用:苏教版(2019) 选修第一册 选填专练 第2章 微专题二 与圆有关的最值、定值问题
2 . 已知点R为曲线
上任意一点,定点
满足
,过点
分别作斜率为
,
的曲线
的动弦AB,CD,设P,Q分别为线段AB,CD的中点.
求曲线的方程;
当线段AB长度最小时,求
;
若
,求证直线PQ恒过定点,并求出定点坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cb9ad1e34877b0db02d0219332b0f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0103772593e637b3c9adf736e92751ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4d535d53fb78e9354a21a2c09593b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4e5df6f119904492064df4a63d875ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f375dc5addedc5f9fbb72d566939c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/731f980ccb6f902d460d0ea2920bfe2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cb9ad1e34877b0db02d0219332b0f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f375dc5addedc5f9fbb72d566939c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4bb89a362c1faf4d0c306eabbb59710.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80036fbb56747a7a63faed9cee348d9d.png)
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