解答题-问答题 适中0.65 引用1 组卷3432
如图,在棱长为2的正方体
中,
分别是棱
的中点,点
分别在棱
,
上移动,且
.
当
时,证明:直线
平面
;
是否存在
,使平面
与面
所成的二面角为直二面角?若存在,求出
的值;若不存在,说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/28/cfe4cfbb-cd3a-4a7f-b0ca-0d12b1496f29.png?resizew=214)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571783122010112/1571783127924736/STEM/31e0debe28b14f4b9b528ee8997ef660.png)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571783122010112/1571783127924736/STEM/050ec932667949a88859bc2a1e7df91b.png)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571783122010112/1571783127924736/STEM/24c5b5897e74432f8f6ffb23e5780a8a.png)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571783122010112/1571783127924736/STEM/af01c2520a77440e8403e30e18c5723e.png)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571783122010112/1571783127924736/STEM/a306f425b305408f88c99f0380bef7a8.png)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571783122010112/1571783127924736/STEM/8698f2c903ea4cf3af99dc55b9a311a4.png)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571783122010112/1571783127924736/STEM/a79d7b02119b4432a9ded40d88a281ed.png)
当
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571783122010112/1571783127924736/STEM/bdb99a01a3914d4eb2d59d5494d58bc9.png)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571783122010112/1571783127924736/STEM/516c1ee9330c430ea4494ef03d6824f9.png)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571783122010112/1571783127924736/STEM/6a056f212c454130a8714815d6a64aa5.png)
是否存在
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571783122010112/1571783127924736/STEM/1d14f11dc39641f19669750777723e0a.png)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571783122010112/1571783127924736/STEM/6a056f212c454130a8714815d6a64aa5.png)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571783122010112/1571783127924736/STEM/459801040bb2479caec1e3efaac428d5.png)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571783122010112/1571783127924736/STEM/1d14f11dc39641f19669750777723e0a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/28/cfe4cfbb-cd3a-4a7f-b0ca-0d12b1496f29.png?resizew=214)
2014·湖北·高考真题
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