在正方体
中,M,N分别为AD,
的中点,过M,N,
三点的平面截正方体
所得的截面形状为( )
![](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/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
A.六边形 | B.五边形 | C.四边形 | D.三角形 |
2023·河南·模拟预测 查看更多[2]
更新时间:2023-05-13 16:30:25
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【推荐1】如图,在一个正方体中,E,G分别是棱
,
的中点,F为棱
靠近C的四等分点.平面
截正方体后,其中一个多面体的三视图中,相应的正视图是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/27/c0485ae1-2235-4cbe-806d-43f416709cce.png?resizew=203)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ecac2dad4cffdd971fd23deacff3fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffe8a84ca3a13f82aff1a022edc66065.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/27/c0485ae1-2235-4cbe-806d-43f416709cce.png?resizew=203)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】已知正方体
,过点B且以
为法向量的平面为α,则α截该正方体所得截面的形状为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d3aeafad20aa1777868b169b228ec3b.png)
A.三角形 | B.四边形 | C.五边形 | D.六边形 |
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【推荐3】正方体
的棱长为
,
、
,
分别为
,
,
的中点,有下述四个结论,其中正确的结论是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/18/a194afa2-000b-461d-89ae-04444e0fa185.png?resizew=184)
①直线
与平面
平行;
②平面
截正方体所得的截面面积为
;
③直线
与直线
所成的角的余弦值为
;
④点
与点
到平面
的距离相等.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/18/a194afa2-000b-461d-89ae-04444e0fa185.png?resizew=184)
①直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62b633158f7d9c35d476a324a683f458.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03428a8f91a5674cb8f54766c165f7e.png)
②平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03428a8f91a5674cb8f54766c165f7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4700efcb84c4027ce7a50af0d5212fc.png)
③直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04777f3f4661fa1c08a1cc0dfb807c7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8931bc6875737960d71e70e66d6f749.png)
④点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03428a8f91a5674cb8f54766c165f7e.png)
A.①④ | B.①② | C.①②④ | D.①②③④ |
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【推荐1】如图,正方体ABCD—A1B1C1D1中,O为底面ABCD的中心,
M为棱BB1的中点,则下列结论中错误的是
![](https://img.xkw.com/dksih/QBM/2015/1/12/1571958301818880/1571958306783232/STEM/0205e411bb5942f4bd0d7e0de4e0150b.png)
M为棱BB1的中点,则下列结论中错误的是
![](https://img.xkw.com/dksih/QBM/2015/1/12/1571958301818880/1571958306783232/STEM/0205e411bb5942f4bd0d7e0de4e0150b.png)
A.D1O∥平面A1BC1 |
B.D1O⊥平面AMC |
C.异面直线BC1与AC所成的角等于60° |
D.二面角M-AC-B等于45° |
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【推荐2】 在棱长为
的正方体
中,点
,
分别是线段
,
(不含端点)上的动点,且线段
平行于平面
,则四面体
的体积的最大值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8456cee87c4e22351affc28f3a73a0f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2708fa6298e52f617383efc175b71ddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b9cb8e6ff801523b0304576cd69fd2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe734023d4e70010a6b2cc3267cb86e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3374d1a9a1f7d0da074069eb640336c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e22ebcc4aa98d46366df48f751a5f368.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/934ffeb85058e657412b8d6b80d52a54.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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