已知
.
(1)当
时,求证:
;
(2)若存在
,使得
成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a7166b30b49fc71822f6fba2107385d.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/804b45b347ff8a0d66a4130202b5d09e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb97093e128d6d658cb2a1d7f8911cf9.png)
(2)若存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c7473a4c89ac7cbb3a4c31b9b079a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071f7035556b9d035fdfe18e3c3a48f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
2018高二下·全国·专题练习 查看更多[2]
更新时间:2018-04-18 19:48:35
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