1 . 已知函数![](https://img.xkw.com/dksih/QBM/2016/11/24/1573170390114304/1573170396291072/STEM/c3b19861487744c79f9ddc7795da6b09.png)
(1)若
,解不等式
;
(2)若不等式
对一切实数
恒成立,求实数
的取值范围.
![](https://img.xkw.com/dksih/QBM/2016/11/24/1573170390114304/1573170396291072/STEM/c3b19861487744c79f9ddc7795da6b09.png)
(1)若
![](https://img.xkw.com/dksih/QBM/2016/11/24/1573170390114304/1573170396291072/STEM/1ecbcb5d5dd9482d8a2214c2c7113469.png)
![](https://img.xkw.com/dksih/QBM/2016/11/24/1573170390114304/1573170396291072/STEM/a1168ed0d2924f429076e3d6468ab7a3.png)
(2)若不等式
![](https://img.xkw.com/dksih/QBM/2016/11/24/1573170390114304/1573170396291072/STEM/92050f131b074b2198b5d2c08285b7fe.png)
![](https://img.xkw.com/dksih/QBM/2016/11/24/1573170390114304/1573170396291072/STEM/a9e871b3a9844537b64e28822ce1f1fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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2 . 已知
,点P的坐标为
则当
时,P满足
的概率为________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5ba4fe286099f15dc566069f0d1b49c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d187a39e14f74f8f856bc6d8a0b91b33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dcbca3478eae63853d2aab5332e2e56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e189ae00368c867ab7114c3e05451077.png)
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3 . x,y满足约束条件若z=y-ax取得最大值的最优解不唯一,则实数a的值为_____
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