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解题方法
1 . 已知圆
.圆D的圆心D在y轴上且与圆C外切.圆D与y轴交于A、B两点,点P为
.
(1)若点D坐标为
,求
的正切值;
(2)当点D在y轴上运动时,求
的正切值的最大值;
(3)在x轴上是否存在定点Q,当圆D在y轴上运动时,
是定值?如果存在,求出点Q坐标;如果不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/553b19083c401c2fd2486c6297a92d14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcbcd0aebdd8bd688d108834747009f5.png)
(1)若点D坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb0e705301752424a492f6277ed7774e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
(2)当点D在y轴上运动时,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
(3)在x轴上是否存在定点Q,当圆D在y轴上运动时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c7bbe0ac1c88c9d35978a7184ba553.png)
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2 . 在平面直角坐标系
中,已知圆
的圆心在
轴右侧,原点
和点
都在圆
上,且圆
在
轴上截得的线段长度为3.
(1)求圆
的方程;
(2)若
,
为圆
上两点,若四边形
的对角线
的方程为
,求四边形
面积的最大值;(若A(x1,y1),B(x2,y2)在直线Ax+By+C=0两侧,则(Ax1+By1+C)·(Ax2+By2+C)<0);
(3)过点
作两条相异直线分别与圆
相交于
,
两点,若直线
,
的斜率分别为
,
,且
,试判断直线
的斜率是否为定值,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3c9708ef0dc6d6f5dcf6596d3e4f6e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(1)求圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d231311a8897586fbb3dd68f764afe92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51fbb4d7aa18b671a845ec7bc67f87d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d231311a8897586fbb3dd68f764afe92.png)
(3)过点
![](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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6defc43285a40f7ccb74c1cc04265eba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423b7ae39db552e60ee8b1d27312306f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83d200a411fbc2f50ad72f1fd729a7d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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2021-12-15更新
|
385次组卷
|
2卷引用:上海师范大学附属中学2022-2023学年高二下学期3月第二次月考数学试题
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3 . 已知方程
的曲线是圆C,
(1)若直线l:
与圆C相交于M、N两点,且
(O为坐标原点),求实数m的值;
(2)当
时,设T为直线n:
上的动点,过T作圆C的两条切线TG、TH,切点分别为G、H,求四边形TGCH而积的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a63e5b49f2d9250289968f53b0d7c2f0.png)
(1)若直线l:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3aa3adcb154f6144903d456289ecb0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/328e4cc042e5177d41c17c3679164ba5.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/711b21672fd907c5c92fee1d649e7003.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0947dc8f5ba116aaf3239d66adc7474.png)
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2020-02-29更新
|
453次组卷
|
3卷引用:上海市七宝中学2019-2020学年高二上学期12月月考数学试题
18-19高三上·上海浦东新·阶段练习
名校
4 . 已知
,
.
(1)若直线
与圆
:
相切,求
被圆
:
所截得弦长取最小值时直线
的斜率;
(2)
时,
:
表示圆,问是否存在一条直线
,使得它和所有的圆
都没有公共点?如果存在,求出直线
,若不存在,说明理由;
(3)若满足不等式
和等式
的点集是一条线段,求
取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26ed12cb5a1ec347897ca9d152ce8c8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c5e5c456257df9ecf2dd8c903f033ff.png)
(1)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8b657b79c215be501b9577e96ff6d0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de6325118467658684d0d8d4b2941534.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c87f4c40e50504adaface510404dbfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/963080e1603beebf5f07ad5cc1d33ecb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4a18c013ff8e2ac81169f64618ddb69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/963080e1603beebf5f07ad5cc1d33ecb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(3)若满足不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5a263196692586680af1642b4d5dcd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83a0bb7efca072908aab035cccab67a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
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