设向量
,
,
为锐角.
(Ⅰ)若
,求
的值;
(Ⅱ)若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/605f9d111326a63c36e53cac39d14b79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e499a570b637ba85d5209c1107cc83d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26ab55147ca5c0f958af43b0637ee31b.png)
(Ⅰ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdb7f6d2b2f1851a599cd418e02ca6bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10c248aff8ab26fa784628b321a05a07.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f3401a0f05b6fe79c2b2969b95fbbec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aca6d9556238b636df975020a8656b.png)
更新时间:2016-12-03 17:22:08
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解题方法
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【推荐3】已知向量
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec1e245aa16522e6b9ac3e8081130113.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a1673cdaceb29111e4476281b13d88a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa58437f6aa7d2ce33ed874e8bda911.png)
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