解题方法
1 . 如图,在正方体
中,点P是线段
上的一个动点,有下列三个结论:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/fd2fd0fc-07ac-4c7a-b5c0-d77316122b86.png?resizew=175)
①
平面
;
②
;
③若点P与B不重合,则平面
平面
.
其中所有正确结论的序号是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/fd2fd0fc-07ac-4c7a-b5c0-d77316122b86.png?resizew=175)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24579dca7ff1542ae019fc36110dddbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da7977ab975efa6411cc17de39be70d9.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eee37319c34c99cf839332a54dbcc68.png)
③若点P与B不重合,则平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed5aaa754b644e971a79471566f75854.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36bfdb78c3a35e0b79bf59e5f6a170b3.png)
其中所有正确结论的序号是( )
A.①②③ | B.②③ | C.①③ | D.①② |
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