名校
解题方法
1 . 如图,在直三棱柱
中,
,
,
,M,N分别是
,
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/23/d4920206-3b1f-4eab-b3da-5babedcfc9a7.png?resizew=152)
(1)求证:
;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca38004c7744a7567bef30f0674fe60f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a3cc9cccfb4c260dac05f4ed57e8c10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92535536bd3c2761724fd058427f95a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a696a182fff038a86b2bbe8ca099442.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/23/d4920206-3b1f-4eab-b3da-5babedcfc9a7.png?resizew=152)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce9ebc509c57beab91d0833dba1b2c6.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9112e61822a648db4979de272f69cbea.png)
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2022-08-22更新
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454次组卷
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4卷引用:贵州省贵阳市2023届高三上学期8月摸底考试数学(文)试题