解答题-证明题 适中0.64 引用2 组卷509
如图,四棱锥
中,底面
为菱形,
面
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/2016/3/7/1572521169772544/1572521176088576/STEM/d36408da724c46a2b024a2277b6d6fd0.png)
(1)求证:
平面
;
(2)设
,
,
,求点
到平面
的距离.
![](https://img.xkw.com/dksih/QBM/2016/3/7/1572521169772544/1572521176088576/STEM/bbabb7754bfb4ba8b6b1a85c9c3d3627.png)
![](https://img.xkw.com/dksih/QBM/2016/3/7/1572521169772544/1572521176088576/STEM/881e49286115432fa8b6e211e0af32e6.png)
![](https://img.xkw.com/dksih/QBM/2016/3/7/1572521169772544/1572521176088576/STEM/62d4e4222d3e44cd9018e26d39f26cb2.png)
![](https://img.xkw.com/dksih/QBM/2016/3/7/1572521169772544/1572521176088576/STEM/881e49286115432fa8b6e211e0af32e6.png)
![](https://img.xkw.com/dksih/QBM/2016/3/7/1572521169772544/1572521176088576/STEM/57a4f787663145f5b7bfc0ecb202eca3.png)
![](https://img.xkw.com/dksih/QBM/2016/3/7/1572521169772544/1572521176088576/STEM/fede770a0d914d4cb21e9b6d52d4b296.png)
![](https://img.xkw.com/dksih/QBM/2016/3/7/1572521169772544/1572521176088576/STEM/d36408da724c46a2b024a2277b6d6fd0.png)
(1)求证:
![](https://img.xkw.com/dksih/QBM/2016/3/7/1572521169772544/1572521176088576/STEM/334319b6e5f4406296901e01acd9e397.png)
![](https://img.xkw.com/dksih/QBM/2016/3/7/1572521169772544/1572521176088576/STEM/05ed8c64171140af989f94238103f79c.png)
(2)设
![](https://img.xkw.com/dksih/QBM/2016/3/7/1572521169772544/1572521176088576/STEM/e946906caaab45a486fff27f1b580f47.png)
![](https://img.xkw.com/dksih/QBM/2016/3/7/1572521169772544/1572521176088576/STEM/f4fe43d69722499f997ea2d5196f12df.png)
![](https://img.xkw.com/dksih/QBM/2016/3/7/1572521169772544/1572521176088576/STEM/37b76889e5f547f291ce4318dc25a8c1.png)
![](https://img.xkw.com/dksih/QBM/2016/3/7/1572521169772544/1572521176088576/STEM/fa16256839814123ab502079aae7de21.png)
![](https://img.xkw.com/dksih/QBM/2016/3/7/1572521169772544/1572521176088576/STEM/9b75ed901f4f4637bc482da2cd397cbe.png)
16-17高三上·河北石家庄·期末
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