解题方法
1 . 如图所示,在直四棱柱
中,
,
,
,P为棱
上一点,且
(
为常数),直线
与平面
相交于点Q.则线段
的长为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16aad38b43462ca7a8fb9bc9484ad3a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ececd428cc1a2afe8ee8a6b14b726cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1859959fdb4c5edd8056893f94a10a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0241e295f9b19640cb4579f6c6ecbd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e3334853138fb74687d66b1e45f2fd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7241eada5920f62784d6b6f9b50d9e19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d41164f8a9f6fe32a9364f18f168dd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/26/50409685-a753-4511-a386-03eb3bdb1c33.png?resizew=145)
您最近一年使用:0次
2 . 在棱长为2的正方体
中,已知点P为棱
的中点,点Q为棱CD上一动点,底面正方形ABCD内的点M始终在平面
上,则由所有满足条件的点M构成的区域的面积为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a019240236421a56d33ed143b476154.png)
您最近一年使用:0次