解题方法
1 . 将一边长为
的正六边形沿
对折,然后将它倒放在水平面上,就构成了如图乙所示的五面体,底面
是正方形.
![](https://img.xkw.com/dksih/QBM/2022/5/3/2971674429718528/2973409103929344/STEM/5b5449d7-655d-44b2-87df-41893f40fab5.png?resizew=380)
(1)求
的正弦值;
(2)求平面
与平面
夹角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad3a079cfdcca9acdacecbf08f9f78cc.png)
![](https://img.xkw.com/dksih/QBM/2022/5/3/2971674429718528/2973409103929344/STEM/5b5449d7-655d-44b2-87df-41893f40fab5.png?resizew=380)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d3f19ab76b27b47aeaaf4a66f0e580b.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/546990b47ca3fdd5681de4749246d38e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/128c69eb81dae89c6989d06d20925ad2.png)
您最近一年使用:0次
2 . 已知
,
.
(1)在
轴上求一点
,使
;
(2)在
平面内的点
到
点与到
点等距离,求
点的轨迹.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40cb141eaf6c8146304d0bf6dc9bd379.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b9a2ba51dc2d8af0dbf9ffb8ab4a03b.png)
(1)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f30acc34f4ee1077532ae6808af2ab2.png)
(2)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7d96461d2b3421aed548b754637ca8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
您最近一年使用:0次