1 . 设
,记
.
(1)若
,当
时,求
的最大值;
(2)
,且方程
有两个不相等实根m,n,求mn的取值范围;
(3)若
,且a,b,c是三角形的三边长,求出x的范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9c812e569a98b27ce189fb4ce5f0d81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bca4be345087f993a4078e16c16608e2.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44904a461cfcd1b9877416434b681d96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2269110e9702a694aeb4855b2d993781.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eb7df298a9364b36e079a61caec815c.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06df4c08481194783d9f7f39ccbf7de6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05503cdd30e40ada3f94372cd0442066.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/269276cba411c7fa9664687c1bb01243.png)
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2 . 设函数f(x)=
,若f(a+1)≥f(2a﹣1),则实数a的取值范围是 .
![](https://img.xkw.com/dksih/QBM/2017/10/9/1791391176564736/1792087614734336/STEM/265d8bbc73e64d5aa6f67bf5a64699de.png?resizew=79)
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