题型:解答题-问答题
难度:0.65
引用次数:902
题号:10934489
已知曲线C:y=
,D为直线y=
上的动点,过D作C的两条切线,切点分别为A,B.
(1)证明:直线AB过定点;
(2)若以E(0,
)为圆心的圆与直线AB相切,且切点为线段AB的中点,求该圆的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e50520e416713b6ef6edbc58d586112b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3389f53711264b0acba3ba6019f8b908.png)
(1)证明:直线AB过定点;
(2)若以E(0,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/533a7b702ada1dd80123e4041271d521.png)
更新时间:2020-08-18 00:03:57
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适中
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解题方法
【推荐1】已知圆C:
,圆心C在直线
上,且圆C被直线
截得的劣弧所对的圆心角为
.
(1)求圆C的方程;
(2)过圆A:
上任一点P作圆C的两条切线,切点分别为M和N,求四边形PMCN的面积的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/835b6de56d01d3c6a6988542409ca286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5ce1369b877ab954121015ffa229f3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6606b54c7f2d342f56cf6df26665d2f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f785147690f83dcee0a0bc6c327e75a.png)
(1)求圆C的方程;
(2)过圆A:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a986e789e8e8a7422e4fc88d434efc.png)
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【推荐2】如图,在平面直角坐标系
中,已知以
为圆心的圆
及其上一点
.
(1)设圆
与
轴相切,与圆
外切,且圆心
在直线
上,求圆
的标准方程.
(2)设点
满足:存在圆
上的两点
和
,使得四边形
为平行四边形,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2884db1e1c7b7052279bd7546fe5eac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bc59979afc2620b046822c643391168.png)
(1)设圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39cc033406da2cdd342308972c6701f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
(2)设点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/439e95540157803d4ac3cf61a49f50a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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【推荐1】在直角坐标系
中,曲线
的参数方程为
(
为参数),以坐标原点
为极点,
轴正半轴为极轴建立极坐标系,曲线
的极坐标方程为
.
(1)求曲线
的普通方程与
的直角坐标方程;
(2)若曲线
上的动点
到曲线
的最小距离为
,求实数
的值.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e561532b21ea9e390568daa7b59f57cd.png)
(1)求曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
(2)若曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7116071164cdc45f5d312a437c68bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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【推荐2】已知点
,过点
作抛物线
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,切点
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(1)求切点
的纵坐标;
(2)有一离心率为
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、
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、
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的方程.
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(1)求切点
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(2)有一离心率为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
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