1 . 如图是一正方体的表面展开图.
、
、
都是所在棱的中点.则在原正方体中:①
与
异面;②
平面
;③平面
平面
;④
与平面
形成的线面角的正弦值是
;⑤二面角
的余弦值为
.其中真命题的序号是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7592c4f01c8e06c7ee90df5b9413a9f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81cd729469b9aa6655beb1c6c6198476.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a36208b4b70c4c31efd7902005ab26ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf279f1376268f274209149e0add8410.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b15febfda66e733f14aa7115ed4343a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f64032b13025778a668e3cb1e1574ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37d8e29bcdd1d2b133292c2e50df7d5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7294f5ae2a24ff42e84cd9773b2a7287.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/f1636331-e37a-45b6-9fa7-7257eb3239a1.png?resizew=161)
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2019-09-18更新
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4卷引用:【新东方】杭州新东方高中数学试卷330