如图,正方形
的边长为
,已知
,将
沿
边折起,折起后
点在平面
上的射影为
点,则翻折后的几何体中有如下描述:
①
与
所成角的正切值是
;
②
;
③
是
;
④平面
平面
;
⑤直线
与平面
所成角为30°.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/234153f6-1b26-4a6d-b371-9a0c186b309e.png?resizew=323)
其中正确的有________ .(填写你认为正确的序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7f2125dfe51596f77b060572f706cbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b4424cb0af429b92e1fc168c4c70de4.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3db5169270ae5637c510cf7675c0758a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24396cb91a5919edf0594a0b1d6f4a00.png)
④平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d7090639341730951c1bc3c9b6164e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d78fc7fcb2762de28dcef8aa3aa0e49.png)
⑤直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1642eec556eb252de9c1ab7bb5ca90b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1776d156423ea523de87fbca6c0b6019.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/234153f6-1b26-4a6d-b371-9a0c186b309e.png?resizew=323)
其中正确的有
更新时间:2020-05-03 16:19:55
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