已知平面向量
满足
,且
的夹角为
.
(Ⅰ)求
的值;
(Ⅱ)求
和
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef340aab7b90a60b8def5f8028ab3b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af016aa523ecd55148f18854cd0ab15e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef340aab7b90a60b8def5f8028ab3b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
(Ⅰ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e225297418ba60d303578d96116f2e22.png)
(Ⅱ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/666dd921a9619a13967d04b5710bf93b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3364b5989fa241b26266c0d96ab9714.png)
16-17高一下·浙江湖州·期末 查看更多[8]
更新时间:2017-08-07 12:28:45
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适中
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名校
【推荐1】设向量
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解答题-问答题
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【推荐2】已知
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【推荐1】已知平面上三个向量
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4984318d967b210ce49f126794dad06b.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc6bc4b33688de2c192e83259160b792.png)
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(2)若
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解答题-问答题
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适中
(0.65)
名校
【推荐2】如图,在边长为2的等边三角形
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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(1)求向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/304a7f07db2ec637baadf8f0ab91c85c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddfff89daefe0c36b444d4e971deb057.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2b0ba14e41e306e5633ad4bf1cdedd8.png)
(3)通过本题的解答,试总结利用平面向量解决平面问题的基本方法
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