名校
1 . 已知向量
,
,
.
(1)若
,求x的值;
(2)记
,求
的最大值和相应的x值以及单调递减区间.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92864f3aede0af6a7689cd8763acd6a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a5b8d95f9204731070b1ba6541aacdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ce485410257c9c1fae9d87ce3e44cc8.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aad6d8d586a76b9379d5f4b870558b8a.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d50b133dfe6ab9dfdf6270cf8d4e408.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
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2020-07-24更新
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4卷引用:福建省厦门第六中学2021-2022学年高二上学期开学适应性练习数学试题