已知平面向量
,
.
(1)若
,
,求实数
的值;
(2)求函数
的单调递减区间.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff1dbce2d726487ac3354d4071114ba4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcd66601ba2257629f69d6d4305bc82f.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e32b6dc307d12bbd6b850a67b0599620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ce485410257c9c1fae9d87ce3e44cc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a26c2087e3a2711f42846403839c200e.png)
更新时间:2020-10-20 15:37:50
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解题方法
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