名校
1 . 如图所示,在三棱锥
中,
是边长为
的正三角形,且平面
平面
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/0703cf7b-76f2-4495-9a38-508b4a41dfe7.png?resizew=167)
(I)求证:
平面
;
(II)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc2aaed1e9ead175f30f7130569d0411.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f406965e1a56b161ff7b61f3c8bbf9ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/566866c39352ba27f4179ac1f3a20c44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/787ac5e13622afab5e9f8603afe42356.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/948de7780b28259851afba4995019d28.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/0703cf7b-76f2-4495-9a38-508b4a41dfe7.png?resizew=167)
(I)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8acde6a4543f7c7dc745c542cda311b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27d39f37441ee55dbc8f1a6ca199a66b.png)
(II)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4da035673ef0edcfae6b72fb5e5ba34a.png)
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2019-04-01更新
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676次组卷
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2卷引用:贵州省凯里市第一中学2019届高三下学期模拟考试《黄金卷二》数学(文)试题