12-13高一上·吉林·期末
1 . 如图,已知两条直线l1:x-3y+12=0,l2:3x+y-4=0,过定点P(-1,2)作一条直线l,分别与l1,l2交于M、N两点,若P点恰好是MN的中点,求直线l的方程.
![](https://img.xkw.com/dksih/QBM/2013/2/22/1571118447132672/1571118452727808/STEM/6afc65121871450084a96042a86adfac.png)
您最近一年使用:0次
2 . 已知点
的坐标是
,过点
的直线
与
轴交于
,过点
且与直线
垂直的直线
交
轴与点
,设点
为
的中点,求点
的轨迹方程.
![](https://img.xkw.com/dksih/QBM/2015/12/14/1572355636092928/1572355641720832/STEM/2fd40d6c36be4506ab59e089a8e0c3c7.png)
![](https://img.xkw.com/dksih/QBM/2015/12/14/1572355636092928/1572355641720832/STEM/01dc44d2ab604e128b7361245f098d64.png)
![](https://img.xkw.com/dksih/QBM/2015/12/14/1572355636092928/1572355641720832/STEM/2fd40d6c36be4506ab59e089a8e0c3c7.png)
![](https://img.xkw.com/dksih/QBM/2015/12/14/1572355636092928/1572355641720832/STEM/fb134540de2a4a0d90a03ab47d349f28.png)
![](https://img.xkw.com/dksih/QBM/2015/12/14/1572355636092928/1572355641720832/STEM/7c25d615a957479bbb1a0102429db90e.png)
![](https://img.xkw.com/dksih/QBM/2015/12/14/1572355636092928/1572355641720832/STEM/ffc0eef07d894caea547735d17e9e897.png)
![](https://img.xkw.com/dksih/QBM/2015/12/14/1572355636092928/1572355641720832/STEM/2fd40d6c36be4506ab59e089a8e0c3c7.png)
![](https://img.xkw.com/dksih/QBM/2015/12/14/1572355636092928/1572355641720832/STEM/fb134540de2a4a0d90a03ab47d349f28.png)
![](https://img.xkw.com/dksih/QBM/2015/12/14/1572355636092928/1572355641720832/STEM/91b3edc407d4423d890c2cc3754647a7.png)
![](https://img.xkw.com/dksih/QBM/2015/12/14/1572355636092928/1572355641720832/STEM/0995f866aa8c438bb7c93fdee74d8929.png)
![](https://img.xkw.com/dksih/QBM/2015/12/14/1572355636092928/1572355641720832/STEM/f42745465158468892b0ad4f976c72cb.png)
![](https://img.xkw.com/dksih/QBM/2015/12/14/1572355636092928/1572355641720832/STEM/0f0326a78a64459ca671c3ba48824444.png)
![](https://img.xkw.com/dksih/QBM/2015/12/14/1572355636092928/1572355641720832/STEM/892848e44e6c4624a6abcbd43e0ded97.png)
![](https://img.xkw.com/dksih/QBM/2015/12/14/1572355636092928/1572355641720832/STEM/0f0326a78a64459ca671c3ba48824444.png)
您最近一年使用:0次
3 . 在
中,顶点
,
,
、
分别是
的重心和内心,且
.
求顶点
的轨迹
的方程;
过点
的直线交曲线
于
、
两点,
是直线
上一点,设直线
、
、
的斜率分别为
,
,
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba4830a5e6437787c7cfc05f8b5c3ad7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37e878bdc375dab19fade97e8ffa85bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cef1c98d3599f08794f0d90966fe87f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4c783bab7586f60dc14d4f10b6d5b12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61a0263314b244a157d2f81a7fa2359d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba4830a5e6437787c7cfc05f8b5c3ad7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdcfe463ccec690aa818dd4ebd4b9fd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1baca09215d12421a58bd6a48ae16c35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5aa5694373bd78b1ca2180f831bf1c8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f9c827e46d1a395fafbf15cdd6c6c42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac0c12379ff58d8ddf66547d7a873baf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca66a268d6f46e0e9d5d9151b785be60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f9c827e46d1a395fafbf15cdd6c6c42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ab653ffa6acf8b28096ff54719579d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/316ecb1589c3cc179e2f62507020771e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d84326b6492a5ca36a291f7c4c184d38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f23d29646155e27b172ecdf263e2d702.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4446eae75ffae2cde44686577653cec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12a7bad1eeb9b7e41965acf3b247f6c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00f1c8a441108e2dd80f01061e9b29f4.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/dbf434334b09cc0fdd4e86e84e6ceb00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7da98c5cd1101b4b10a0e250320809b6.png)
您最近一年使用:0次
10-11高三下·吉林延边·阶段练习
4 . 斜率为-
,在y轴上的截距为5的直线方程是 ( )
![](https://img.xkw.com/dksih/QBM/2011/4/2/1570103107338240/1570103112278016/STEM/0f80d6d0fea74d37845e023419481649.png?resizew=16)
A.x-2y =1 | B.x + 2y = 10 |
C.x-2y + 10 = 0 | D.x + 2y + 10 = 0 |
您最近一年使用:0次