如图所示,在空间四边形ABCD中,
,
,
、且点E、F分别为BC、AD中点,若
x
y
z
、则x=____ ,y=______ ,z=________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac265febbf99dccf51aa0a2253e61f1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18663288c2245e1febaa003e3b58f56a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4f5b4798ad828329eeee4ab65d12012.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52f95011066f40e5154b750675e396a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7af9d9737b8e15a3d20435848ea223ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65d1d3a4d25b5c208122c27186a51b8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d366d8fbb7258ee051f49977441e14a2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/7e84be8a-f97f-46d1-938f-94f1eff8bfb6.png?resizew=180)
20-21高二上·北京顺义·期中 查看更多[2]
更新时间:2021-10-24 09:55:47
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【推荐1】如图,在平行六面体
中,
,
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7046ea5ec8bb0f777482b086d181e2e9.png)
.则
与
所成角的余弦值为____________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3da8c338342e38c9aa3f274c053fd5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd21a4e45dc1beb069d7e78f84a51544.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7046ea5ec8bb0f777482b086d181e2e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432aca761e9fa97d3728a8038de81e5a.png)
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【推荐2】如图,平行六面体
各条棱长均为2,
,
,则线段
的长度为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a674aa2ce5caabcad5abe65b5402ce6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce0d7095ddd69d6ceaf1065b1bc2c79d.png)
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【推荐1】设
是空间的一个单位正交基底,且向量
,若
,则用基底
表示向量![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db0ffba8c13d607e2fdaa9da73f88b14.png)
______________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43208c7885ae4d4763c7d7f5df84fe1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8849793d8eda2960812663508eff800.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db0ffba8c13d607e2fdaa9da73f88b14.png)
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【推荐2】已知向量
是空间的一个单位正交基底,向量
是空间的另一个基底.若向量
在基底
下的坐标为(3,5,9),则
在基底
下的坐标为___ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae951e0bb5a2a406f1572fc1e4964265.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e73314a9f8bd3678278e265246a41199.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/759bc4eeb0c937af667093c416ed83bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae951e0bb5a2a406f1572fc1e4964265.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/759bc4eeb0c937af667093c416ed83bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec0a70bfeb9a01dbe42a75eafc678b06.png)
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