Question

(本小題滿分13分)已知.
（1）求函數(shù)的單調(diào)區(qū)間；
（2）若對(duì)任意恒成立，求實(shí)數(shù)a的取值范圍．

Answer 1

解：(1) 令  
∴   ∴
由于的定義域?yàn)?img src="http://thumb.zyjl.cn/pic5/tikupic/4e/a/d5e7w.gif" style="vertical-align:middle;" />，
∴在單調(diào)遞減，在單調(diào)遞增··············································· 6分
(2) ，由于
當(dāng)x = 1時(shí)，
∴·························································································· 13分

解析