名校
解题方法
1 . 如图①在平面直角坐标系
中,已知![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9366a89d9d925fc623a308a5c5eed30e.png)
,
,动点
在线段
上.
(1)求
的最小值;
(2)以四边形
为底面做四棱锥
如图②,使
平面
,且
,求证:平面
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9366a89d9d925fc623a308a5c5eed30e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/513eafd10fa1ec0196562865517e0b09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1ef8f34e64439c14ec2d8bab581906d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/2/96167441-f610-4722-9679-12b00d193fdd.png?resizew=335)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f524ec18dd8fc2f572a9b1ce532395cd.png)
(2)以四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b81a6235ef96041dbf59ac50e6e5f86f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f3280cd6719ad73e7e6ab77248baa29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02cbddc9b1f36e2cabd9a6c830d14736.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc83f34b5a3c1dc09d990ce4bdc8e078.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/882292451ed3fca6df1e925d12377f0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d28c625d7ac6878957facc8274d459c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06bf006d9cf9568dd567c25fd20a0c85.png)
您最近一年使用:0次