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1 . 已知
,求k为何值时:
(1)
;
(2)
;
(3)
与
的夹角为钝角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a336256c31e7b85e7e1e9ec23580436e.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/394518f518e8eee4c6370fdfe90e71b7.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa5aa846a5b7c96fe2ce665eb1ea5f0e.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
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2022-07-05更新
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527次组卷
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4卷引用:江苏省南京市中华中学2021-2022学年高一下学期期末数学试题