若
,且
,则
与
的夹角是____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b772c96922173aaea5ac1beebc4782df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/388c767688a60034db4711425094d41f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/969604545902c9a66549a4a44ec3a3c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90ab17fd4247cdd710c363d5d3fbc5bd.png)
10-11高一下·广东汕头·期末 查看更多[3]
更新时间:2016-11-30 23:01:55
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解题方法
【推荐1】设单位向量
,
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填空题-双空题
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适中
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【推荐2】在平面几何图形中,把对角线互相垂直的四边形叫做垂美四边形.如图,在垂美四边形
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(1)边
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(1)边
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(2)若
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______ .
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【推荐3】![](https://img.xkw.com/dksih/QBM/2012/7/7/1570918074310656/1570918079520768/STEM/687a4adafa7147718225afcfd2861c34.png?resizew=487)
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您最近一年使用:0次
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中,
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在边
上,
,
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,若
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__________ .
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