名校
1 . 如图,平面内两条直线
和
相交于点
,构成的四个角中的锐角为
.对于平面上任意一点
,若
,
分别是
到直线
和
的距离,则称有序非负实数对
是点
的“距离坐标”,给出下列四个命题:
①
点有且仅有两个;
②
点有且仅有4个;
③若
,则点
的轨迹是两条过
点的直线;
④满足
的所有点
位于一个圆周上.
其中正确命题的个数是( )
![](https://img.xkw.com/dksih/QBM/2019/12/26/2363451502747648/2364154694139904/STEM/c6e5728f32e8476cb00f4a0460792b0d.png?resizew=224)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/698c4d4e50062b4a7dd70fe1b4ab4fd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7a999c36de5c9a9ce876a4a56fa34c.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3654254401fc902c3cb4912969f21f88.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbb5806ad3816b03f49987d8af825a52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
④满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ba4f3ccc67b91fa01f3d1eb81825449.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/698c4d4e50062b4a7dd70fe1b4ab4fd7.png)
其中正确命题的个数是( )
![](https://img.xkw.com/dksih/QBM/2019/12/26/2363451502747648/2364154694139904/STEM/c6e5728f32e8476cb00f4a0460792b0d.png?resizew=224)
A.1 | B.2 | C.3 | D.4 |
您最近一年使用:0次
2 . 已知圆的极坐标方程为
,圆心为
,点
的极坐标为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e3d627f5fbd04271389d503942d233.png)
___________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95777c97cd8a69c05fb01595918f4c1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fa85fd20564c42239be9ad3fb4d647a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e3d627f5fbd04271389d503942d233.png)
您最近一年使用:0次