已知圆
和直线
.
(1)证明:不论k取何值,直线和圆总有两个不同交点;
(2)求当k取什么值,直线被圆截得的弦最短,并求这条最短弦的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d3d5384c1516ec3940febd26ed6de6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fcba202fcde19b69ca1539fb9499633.png)
(1)证明:不论k取何值,直线和圆总有两个不同交点;
(2)求当k取什么值,直线被圆截得的弦最短,并求这条最短弦的长.
更新时间:2021-12-10 06:53:17
|
相似题推荐
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐1】已知直线
经过两条直线
:
与
:
的交点P,且垂直于直线
:
.
(1)求直线
的方程;
(2)求直线
与两坐标轴围成的三角形的面积S.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9914263ffebdc0aa082603879e8cd847.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb343cfed5f78a4a24f750415abef43e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9fce9427c9b17e4d3cda0c3ff3e2e14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/779aa8528a03282b429e11834d090b44.png)
(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐2】已知直线
.
(1)若直线
与直线
平行,且直线
过点
,求直线
的方程;
(2)若点
坐标为
,过点
的直线与直线
垂直,垂足为
,求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/800837a0a122a7a144b95fc8768279cc.png)
(1)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c0b79b89444e6037166c34973b748be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23a9301fc1ac223f9ddee3e918b4d882.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【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,x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
的普通方程与曲线
的直角坐标方程;
(2)判断曲线
与曲线
公共点的个数,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707de5b35fff1aaf2ceebd5f3c8cce72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77b1b0b0e75670d18731ddb7ad12e1a8.png)
(1)求曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
(2)判断曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】如图,某海面有O,A,B三个小岛(小岛可视为质点,不计大小),A岛在O岛正东方向距O岛20千米处,B岛在O岛北偏东45°方向距O岛
千米处.以O为坐标原点,O的正东方向为x轴的正方向,10 千米为一个单位长度 ,建立平面直角坐标系.圆C经过O,A,B三点.
(1)求圆C的方程;
(2)若圆C区域内有未知暗礁,现有一渔船D在O岛的南偏东30°方向距O岛40千米处,正沿着北偏东30°方向行驶,若不改变方向,试问该渔船是否有触礁的危险?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c05185a60d5d37c5af32ffea71066b1c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/13/f7d73d78-fd3e-43a9-b139-bd8d3d8f613f.png?resizew=150)
(1)求圆C的方程;
(2)若圆C区域内有未知暗礁,现有一渔船D在O岛的南偏东30°方向距O岛40千米处,正沿着北偏东30°方向行驶,若不改变方向,试问该渔船是否有触礁的危险?请说明理由.
您最近一年使用:0次
【推荐1】已知两定点
,
,动点P满足
,直线![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a461995b90655f5133df6f61c2d09bd.png)
.
(1)求动点P的轨迹方程,并说明轨迹的形状;
(2)记动点P的轨迹为曲线E,把曲线E向右平移1个单位长度,向上平移1个单位长度后得到曲线
,求直线
被曲线
截得的最短的弦长;
(3)已知点M的坐标为
,点N在曲线
上运动,求线段MN的中点H的轨迹方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a525534689bd2701205d4ab17574c39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d42f05b013e4b7166cbc87c5a83d6a85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ab34ce6cee0673ab0d37b660d57bc07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a461995b90655f5133df6f61c2d09bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61fbd2f04e1d6ffab5d2ba2ee7dc0497.png)
(1)求动点P的轨迹方程,并说明轨迹的形状;
(2)记动点P的轨迹为曲线E,把曲线E向右平移1个单位长度,向上平移1个单位长度后得到曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3b1a5427d8ff23df0f3ec194756c84c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3b1a5427d8ff23df0f3ec194756c84c.png)
(3)已知点M的坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/601b6e8e0de5e22fb87f5ecac715c5e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3b1a5427d8ff23df0f3ec194756c84c.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
解题方法
【推荐2】已知圆
和圆
,
,
为圆D上动点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/f3858b13-4260-4b1c-922b-6556606e9c7b.png?resizew=219)
(1)过点A作一条直线l,若l被圆C和圆D截得的弦长相等,求直线l的方程;
(2)求证:当点P不在x轴上时,总存在圆C上点M和圆D上点N,使得四边形AMPN为平行四边形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44961a8afaf6845b8091c74bb603289c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc32907e4fbcd113c0a71b9194e5958a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86a6be776cdd229e5c1339265b23624a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/f3858b13-4260-4b1c-922b-6556606e9c7b.png?resizew=219)
(1)过点A作一条直线l,若l被圆C和圆D截得的弦长相等,求直线l的方程;
(2)求证:当点P不在x轴上时,总存在圆C上点M和圆D上点N,使得四边形AMPN为平行四边形.
您最近一年使用:0次