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解题方法
1 . 已知关于x的不等式
的解集为A.
(1)若
,求A;
(2)若
,求a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac0cdf35fd256033009811b269682893.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/843c3f388a75bf981c11ca947a86e5fa.png)
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2 . 选修4-5:不等式选讲
在平面直角坐标系中,定义点
、
之间的直角距离为
,点
.
(1)若
,求
的取值范围;
(2)当
时,不等式
恒成立,求
的最小值.
在平面直角坐标系中,定义点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2009bbb16442829022f71f67954f6706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e5706dc8e7751b5a8163359a648f14b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f7a19707421ee0a0db45f5b89695b06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb15fec0f2b74cc3e94e5305eaff0b0a.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baf1e7659c52892524c77881ca85ccc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9985ad1358d0fddcb8bfc99deb95bf1.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4166972dec0aa3e8694a44eeb941a08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/091c82cf9c6f1a6037aededab53f087d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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