已知函数
.
(1)若
时,试求函数
的单调递减区间;
(2)如果对于一切
、
、
总可以作为三角形的三边长,试求正实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8690b8b635d04f97962ff616b64c6cc.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e10e1c43b86a8cd4360ca9b57232164.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
(2)如果对于一切
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b97767042b3bd627c5e11db437b9c8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be22faef62e7a035eb39a2e020c880e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/120fc4b25381306ebaa4b96a7f03e6c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
更新时间:2018-10-15 15:52:17
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