设向量
,求向量
与向量
的夹角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661735f770d3124b2dfdbde60d971883.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/614b003a9f14fed694128f681b2f1d91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
10-11高二上·湖北荆州·期中 查看更多[1]
(已下线)2010年湖北省荆州中学高二上学期期中考试理科数学卷
更新时间:2010-11-23 09:36:21
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解答题-问答题
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解题方法
【推荐1】已知不共线的向量
满足
,
,
的夹角为θ.
(1)θ=30°,求
的值;
(2)若
,求cosθ的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8ccba3b87a8a48ac3dd5f72d00bdb1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9936a46cc891744d4600f76bb92b694c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/082c6926889f84f438ea35f70bf05f02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8ccba3b87a8a48ac3dd5f72d00bdb1a.png)
(1)θ=30°,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27c250094127e2b3c878d68213b60407.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d35f3251f815a33362e062ebe5c4cf1d.png)
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解答题-问答题
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较易
(0.85)
名校
【推荐2】如图,在
中,已知
,
,
,
边上的中线
,
相交于点P.
;
(2)若
,求
的余弦值,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/620768d59321da6d3b61434c42c4bbbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ebbf53e93cfb552d20dcbf75355a97f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c87a02a2002c33e7f285727c8da8efe.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f81e24376a13d648c2ed0dc73bc710e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45a8a837c11c07073da3ff751d70278.png)
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