名校
1 . 三棱锥
中,
是
的中点,
在
上,且
,
,
,
,
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/15/877c711a-9f72-4b91-ad61-183533c5a7ff.png?resizew=153)
(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/51c9e72fe7d0df9631855715a7b68772.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae60c09521904ab969829bf0d74edd37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df6ea74d59960905478457f9493916da.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/15/877c711a-9f72-4b91-ad61-183533c5a7ff.png?resizew=153)
(1)试用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb573cc0f30d5c32cdad1510793f0e7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6b5a51e65e9b56a9970de33ead263a9.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/e30ac4d34141a960a883fb0c7ce3dd8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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2021-10-14更新
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