1 . 已知代数式
和
.
(1)若
求不等式
的解集(用区间表示);
(2)若
用反证法证明
中至少有一个数不小于
;
(3)若
,不等式
对于任意实数
恒成立,试确定实数
满足的条件.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fe56a82278b144101fda1fa2cf59703.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c0a82f3b0b621e05cf6e77cddb0628e.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e57633f5382f1e757de657153eeb85f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ec13b0a3dbb8e012320504e91baaf2c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b12b1daec402af0a393386b0e589cd59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d33f8ea9598f0d9134721b35565d28e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5d5b84e3d3af2112a4f066c2a9f1387.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
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2 . 已知
,
,
,则
的最大值是_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fff6e7e2b9f2b68b1647f6350b98dc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5faa5fdcd94e4dc99906d78a198f2049.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75eaf97713f43e771a3f9603c19ee24d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/258dbe016982a678fa64b423907b4386.png)
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名校
解题方法
3 . 下列命题中正确的是( )
A.若![]() ![]() ![]() |
B.平流层是指地球表面以上![]() ![]() ![]() ![]() |
C.以方程组![]() ![]() |
D.已知![]() ![]() ![]() |
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