解题方法
1 . 如图,在长方体
中,M,N分别为棱
,
的中点,下列判断中正确的个数为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/7/976e1bd4-e60f-40dd-9944-f574d9b73cd9.png?resizew=203)
①直线
;
②
平面
;
③
平面ADM.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66fb71b75b63594ebeeeebd1963eed5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/7/976e1bd4-e60f-40dd-9944-f574d9b73cd9.png?resizew=203)
①直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81279d0b4ec6603b3b887db8a586a037.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca5dd496ee0c1170ef6dcc48266ee444.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82b724168afaee2ecddf97257180be18.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64814c474b9da1d186cf7f2ff2421c1f.png)
A.0 | B.1 | C.2 | D.3 |
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2022-07-06更新
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2卷引用:第一章 空间向量与立体几何(B卷·能力提升练)-【单元测试】2022-2023学年高二数学分层训练AB卷(人教A版2019)