解题方法
1 . 如图,在三棱柱
中,点D是AB的中点.
![](https://img.xkw.com/dksih/QBM/2020/3/12/2418140642041856/2418547719397376/STEM/3e045eb89467457f976202e860acffe5.png?resizew=253)
(1)求证:
平面
;
(2)若
平面ABC,
,
,
,
,求三棱柱
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://img.xkw.com/dksih/QBM/2020/3/12/2418140642041856/2418547719397376/STEM/3e045eb89467457f976202e860acffe5.png?resizew=253)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4557a368725226f2c8ea2efb7d30e478.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbc7e774e4ae40c23bf4ceed179230ca.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a8bfe2553e852df73185d017c0a62fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f66f1308e0feb67fa5e1946b4965358.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70dc2c20619a4fc12a0cfda59af5b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a1be17e0a3e51cde1f50f384198e71e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
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2020-03-13更新
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3卷引用:河南省2021-2022学年高二上学期学业水平考试数学试题