名校
1 . 设平面向量
、
的夹角为
,
.已知
,
,
.
(1)求
的解析式;
(2)若
﹐证明:不等式
在
上恒成立.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/956879af388928628970155bdb5c2737.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f8e69e4abd4e261077ed177c25ff74d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e074c209d628251349ecb15d76dfaa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cafdd5eff594c3ac6bc585b05c644fe5.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31bcd4e186c9b564603e00e4dfd0e8dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe58c11b71e0ce7e6263b8112aa6140c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51742bc5df0b18cd3a6ca5abfb373bcc.png)
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2023-06-28更新
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3卷引用:四川省泸县第一中学2023-2024学年高二上学期开学考试数学试题