解题方法
1 . 已知直线
和直线
,其中
为常数.
(1)当
时,求直线
与
的距离;
(2)若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2b0828f17a9e54bc825cfe9fd625cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e1b471a286791c55c6cd92b3eef337d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf0086b054ef120408acac806a1b1318.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ce08b357f11ef44c3e8207ac574422a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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2 . 下列四个命题中,正确的个数是
①设
,则圆
与
内切.
②集合
,若
,则
的取值范围是
.
③过点
且在两坐标轴上的截距互为相反数的直线方程为
.
④直线
与直线
的距离是
.
①设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45ba6b6aa6c3f9faba6b03bc193a6e61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa41173c72391b9ae082bdd81d0711f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54329a84abb204cecb237b2bf2ff2bb7.png)
②集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8480466b698689ab33bd68e43b5a8ec8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd9d50619b779c1056602f46b2a95e90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34401650a8c6657a885f61e0fd3db924.png)
③过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bb84029ff8f64d2c1d3d0b6bcd86155.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abd1ceef6e219ee7dfa3f72f3014e92.png)
④直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4358cb4ba3cf673f2cb0d94a7610b6ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a26402db8a40133d7203afbd46c3ea1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9e87edf00167d91f1d5f66b997e4d59.png)
A.1 | B.2 | C.3 ![]() | D.4 |
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