在三棱锥
中,
是
的中点,
在
上,且
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/17/fcb9a3d6-823c-43fa-9757-e6d01b0b360c.png?resizew=161)
(1)试用
,
,
表示向量
;
(2)若底面
是等腰直角三角形,且
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9839448fd9fc1777c0638195d26a78d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7125d09ba8cabadff1c887d2f24ff44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abaddc668eb8631c8831ed23a68c9f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f02853863c6e867a33184f90549e476.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/17/fcb9a3d6-823c-43fa-9757-e6d01b0b360c.png?resizew=161)
(1)试用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae54940f33b8714da5fe3b7546f8b3dc.png)
(2)若底面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/836160959f96ab0b21a44dc07c9c2dc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2739a801c3df9747a436d6d0263f57bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
更新时间:2022-11-09 10:58:14
|
相似题推荐
解答题-问答题
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适中
(0.65)
名校
【推荐1】平行六面体
中,底面
是边长为1的正方形,侧棱
,且
,
为
中点,
为
中点,设
,
,
;
,
,
表示向量
;
(2)求线段
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e322f79e083e471b34950b9ffabffdc1.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f3adc4ed291596abf3bb93ae7a075d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e984585ddf28c039219afcebf229de7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8780f5b68f8907a57c1c2f96233a78c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45ba716f03748c19b7ce2f99af536ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73a0b19e69be46452425916a0fcb49c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3722488cf68b05c22d3e6c0b4de6991.png)
(2)求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
解题方法
【推荐2】已知平面
,
,求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c04e920761449b3f5ca5ac53c8abfc4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72bd8c430f0620d49b3668a03d92e5ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/754bbd99327195520a4ca3ce3b9a0577.png)
您最近一年使用:0次
解答题-问答题
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适中
(0.65)
【推荐1】如图,在三棱锥
中,底面边长与侧棱长均为a,M,N分别是棱
上的点,且
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c4cd264c97c1f261229925cc5a6761.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b633e883c5b78e1d80fcdaa05b5d146e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fc1054a3a9295f5a30c9cea6aa3630c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/17/6155fe9e-481f-44c0-8222-c348cf720cde.png?resizew=195)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐2】如图所示,在四棱锥
中,
,且
,底面
为正方形.
![](https://img.xkw.com/dksih/QBM/2022/3/14/2936124072525824/2937561070387200/STEM/358a8e35-5939-49bf-9403-681618dad92d.png?resizew=165)
(1)设
试用
表示向量
;
(2)求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d02bd5cfe804460846423e77f72db10f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08439b3dea3f91fac7387e58643c4e2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/700f62e4ccc92738259ee7c4aae2e01e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://img.xkw.com/dksih/QBM/2022/3/14/2936124072525824/2937561070387200/STEM/358a8e35-5939-49bf-9403-681618dad92d.png?resizew=165)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e7b9deae7e9b5175dac257013c2e30c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d189ba56ed46476376bb15266540cfef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69d1d3f4733815572b54c8b1bbc76ca8.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f0e65e147b109f2bbfd3a3f502bbc3a.png)
您最近一年使用:0次