14-15高一上·湖南·期末
1 . 在平面直角坐标系内,设
、
为不同的两点,直线
的方程为
, 设
有下列四个说法:
①存在实数
,使点
在直线
上;
②若
,则过
、
两点的直线与直线
平行;
③若
,则直线
经过线段
的中点;
④若
,则点
、
在直线
的同侧,且直线
与线段
的延长线相交
上述说法中,所有正确说法的序号是_____________
![](https://img.xkw.com/dksih/QBM/2014/3/3/1571538912477184/1571538918326272/STEM/f04ec3c0af7e4d2f9e230d8dfdce1a53.png?resizew=67)
![](https://img.xkw.com/dksih/QBM/2014/3/3/1571538912477184/1571538918326272/STEM/efadc7f0be644e829aca6f2026d81594.png?resizew=67)
![](https://img.xkw.com/dksih/QBM/2014/3/3/1571538912477184/1571538918326272/STEM/844046db10fc4179ba8f3bb4b5f4e832.png?resizew=9)
![](https://img.xkw.com/dksih/QBM/2014/3/3/1571538912477184/1571538918326272/STEM/c5e37406297c4cc0b7a3a3977001c165.png?resizew=99)
![](https://img.xkw.com/dksih/QBM/2014/3/3/1571538912477184/1571538918326272/STEM/12d4558f9ca74d0391b0c3e19d8ba5d1.png?resizew=117)
①存在实数
![](https://img.xkw.com/dksih/QBM/2014/3/3/1571538912477184/1571538918326272/STEM/b2a6ae7937424fb785f53e040aac9f3b.png?resizew=15)
![](https://img.xkw.com/dksih/QBM/2014/3/3/1571538912477184/1571538918326272/STEM/ceacd8043356434a835a6434856ddce3.png?resizew=19)
![](https://img.xkw.com/dksih/QBM/2014/3/3/1571538912477184/1571538918326272/STEM/844046db10fc4179ba8f3bb4b5f4e832.png?resizew=9)
②若
![](https://img.xkw.com/dksih/QBM/2014/3/3/1571538912477184/1571538918326272/STEM/3eecf3a886884412b0e438e21231171b.png?resizew=36)
![](https://img.xkw.com/dksih/QBM/2014/3/3/1571538912477184/1571538918326272/STEM/8aab72ce677146d191625325eef9351b.png?resizew=21)
![](https://img.xkw.com/dksih/QBM/2014/3/3/1571538912477184/1571538918326272/STEM/ceacd8043356434a835a6434856ddce3.png?resizew=19)
![](https://img.xkw.com/dksih/QBM/2014/3/3/1571538912477184/1571538918326272/STEM/844046db10fc4179ba8f3bb4b5f4e832.png?resizew=9)
③若
![](https://img.xkw.com/dksih/QBM/2014/3/3/1571538912477184/1571538918326272/STEM/0ee1eee61ac14a10914e8d2d17de77b4.png?resizew=47)
![](https://img.xkw.com/dksih/QBM/2014/3/3/1571538912477184/1571538918326272/STEM/844046db10fc4179ba8f3bb4b5f4e832.png?resizew=9)
![](https://img.xkw.com/dksih/QBM/2014/3/3/1571538912477184/1571538918326272/STEM/87e7a3ca0b2441a6aab5f3d60f715a74.png?resizew=31)
④若
![](https://img.xkw.com/dksih/QBM/2014/3/3/1571538912477184/1571538918326272/STEM/5791add589924e8cacfaf9ceeb324072.png?resizew=36)
![](https://img.xkw.com/dksih/QBM/2014/3/3/1571538912477184/1571538918326272/STEM/8aab72ce677146d191625325eef9351b.png?resizew=21)
![](https://img.xkw.com/dksih/QBM/2014/3/3/1571538912477184/1571538918326272/STEM/ceacd8043356434a835a6434856ddce3.png?resizew=19)
![](https://img.xkw.com/dksih/QBM/2014/3/3/1571538912477184/1571538918326272/STEM/844046db10fc4179ba8f3bb4b5f4e832.png?resizew=9)
![](https://img.xkw.com/dksih/QBM/2014/3/3/1571538912477184/1571538918326272/STEM/203e1bf9fdaf441a827a51c2bff2fce9.png?resizew=9)
![](https://img.xkw.com/dksih/QBM/2014/3/3/1571538912477184/1571538918326272/STEM/87e7a3ca0b2441a6aab5f3d60f715a74.png?resizew=31)
上述说法中,所有正确说法的序号是
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