(1)已知
三个顶点的坐标分别为
,
,
,边
的中点为
,求
边上中线
所在的直线方程并化为一般式;
(2)已知圆
的圆心是直线
和
的交点且圆
与直线
相切,求圆
的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05d2c83d4eb0a4690c86d52eb1c93236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6adeaf8d2bba0a22acfe0b8621aafbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e8ef4bd58d2f3a2d60ddf7b28ffb542.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(2)已知圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9231260a2de7949154b7244bf70785c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21ae15e69f5a7b8354a8ed0872307aba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f39c3017afb1979e9f91014a274283a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
更新时间:2017-05-17 18:01:16
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相似题推荐
解答题-问答题
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(0.65)
解题方法
【推荐1】已知直线
和
的交点为P,求:
(1)过点P且与直线
垂直的直线l的方程;
(2)以点P为圆心,且与直线
相交所得弦长为12的圆的方程;
(3)从下面①②两个问题中选一个作答,
①若直线l过点
,且与两坐标轴的正半轴所围成的三角形面积为
,求直线l的方程.
②求圆心在直线
上,与x轴相切,被直线
截得的弦长
的圆的方程.
注:如果选择两个问题分别作答,按第一个计分.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef2bfc16dcee7cce1f225292f30dac2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f63080caf557613ca126503b920c8ad.png)
(1)过点P且与直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df88a81a08404ef0c3e47e810c857806.png)
(2)以点P为圆心,且与直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eee4d732782a0fe5ff50a5c410ff3ede.png)
(3)从下面①②两个问题中选一个作答,
①若直线l过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5265d99095b635f62c7915298ec0e963.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c0874f019492261eb175bdcc08c189d.png)
②求圆心在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b740d1f7ec8da97b4bd1f55378f9fbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42498f6e0fc9a61c9857b70a87f02c5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbff61fe9d4e93d7cc338489d1c99c40.png)
注:如果选择两个问题分别作答,按第一个计分.
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【推荐2】已知圆
内有一点
,过点
作直线
交圆
于
、
两点.
(1)当
经过圆心
时,求直线
的方程;
(2)当弦
的长为
时,求直线
的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b65c8d0c10c9d2c669f3e6afc480b734.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2007972af3341f27fbc32ce62dfce5e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.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)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(2)当弦
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e2031d209711b058f3d278ede3c1d33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
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解题方法
【推荐1】已知直线
:
与直线
:
的交点为
.
(1)若直线
过点
且与直线
垂直,求直线
的方程
(2)若直线
过点
,且点
和点
到直线
的距离相等,求直线
的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2297db3c14c256b9691fbb8e5bba978.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d1cb41222d27da278a922db1cd5cb34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(1)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ca979687ffb2214e747525635a6912c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1e5eea5f7f98ca8632358b7e49ceb25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
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【推荐2】已知直线l过点(1,0),且与直线
:
和
:
所分别交于A、B两点,且
.求直线l的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3420925dc4cc74b34f35f627119ae37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15ee71cd16525762ba7c697dcc0f32de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e486c25aeb85b5ef77e1ea3f7c2d345c.png)
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【推荐1】如图,在直角坐标系
中,O为坐标原点.动点P在圆
上,过P作y轴的垂线,垂足为N,点M在射线NP上,满足
.
![](https://img.xkw.com/dksih/QBM/2018/11/27/2084536331878400/2085408497262592/STEM/62eb264cd7114e71a4e0cd2b51096bc1.png?resizew=158)
(1)求点M的轨迹G的方程;
(2)过点
的直线l交轨迹G 于A,B两点,交圆O于C,D两点.若
,求直线l的方程;
(3)设点Q(3, t)(t∈R,t ≠ 0),且
,过点P且垂直于OQ的直线m与OQ交于点E,与x轴交于点F,求△OEF周长最大时的直线m的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f2beb91f10d2d8f2aa0dcc3f5cd1598.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34cbc0e2461bf6ba7f3036599d263ac0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00f1ca862be47248d10ccb51a289354b.png)
![](https://img.xkw.com/dksih/QBM/2018/11/27/2084536331878400/2085408497262592/STEM/62eb264cd7114e71a4e0cd2b51096bc1.png?resizew=158)
(1)求点M的轨迹G的方程;
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b8bb214dcfc9f7ede91c04318ef8176.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bd3836cee74fc49d50a02def7d7f8fa.png)
(3)设点Q(3, t)(t∈R,t ≠ 0),且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/275316cf5e95cc190c05002311a6b55e.png)
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【推荐2】椭圆
的左、右焦点分别为
,
,右顶点为
,上顶点为
,且满足向量
.
(1)若
,求椭圆的标准方程;
(2)设
为椭圆上异于顶点的点,以线段
为直径的圆经过
,问是否存在过
的直线与该圆相切?若存在,求出其斜率;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48da128547c4cf9745e8e4b99988a3db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.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/07bb47e0ab95d4cdf6afa61928a5718f.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d295a4cc3a58f9f38ee98337313c81.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
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