在棱长为1的正方体
中,点
为线段
上的动点,下列命题正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe734023d4e70010a6b2cc3267cb86e.png)
A.存在点![]() ![]() ![]() |
B.存在点![]() ![]() ![]() |
C.存在点![]() ![]() ![]() ![]() |
D.任意点![]() ![]() |
更新时间:2021-08-27 14:23:20
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适中
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【推荐1】下列说法不正确的是( )
A.两两相交且不过同一点的三条直线必在同一平面内 |
B.过空间中任意三点有且仅有一个平面 |
C.若空间两条直线不相交,则这两条直线平行 |
D.若直线![]() ![]() ![]() ![]() ![]() |
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适中
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【推荐2】在棱长为2的正方体
中,点
,
分别是棱
,
的中点,则下列说法中正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/394c5d2f55221975503be8aa18022480.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
A.![]() |
B.该正方体的内切球的表面积为![]() |
C.![]() |
D.平面![]() |
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解题方法
【推荐1】在正方体
中,
、
分别是棱
、
中点,则下列结论中正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/24/2745a82c-aa86-4f5a-9ebd-20be30864a1c.png?resizew=154)
A.![]() |
B.![]() ![]() |
C.![]() |
D.![]() ![]() ![]() |
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【推荐2】已知正方体
棱长为2,P为空间中一点,下列论述正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/217e681a-22fa-4d9e-b8fc-e6f214f21209.png?resizew=163)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/217e681a-22fa-4d9e-b8fc-e6f214f21209.png?resizew=163)
A.若![]() ![]() ![]() |
B.若![]() ![]() |
C.若![]() ![]() ![]() |
D.若![]() ![]() ![]() |
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【推荐1】如图,已知正方体
的棱长为2,则( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/14/7c3cc666-c081-4154-b79c-04e940480d0c.png?resizew=190)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/14/7c3cc666-c081-4154-b79c-04e940480d0c.png?resizew=190)
A.![]() ![]() |
B.![]() ![]() |
C.顶点![]() ![]() ![]() |
D.过顶点![]() ![]() ![]() |
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解题方法
【推荐2】如图,在正方体
中,
、
分别为
、
的中点,
为棱
上的动点,则下列选项正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/12/10e54602-744f-4f05-9e8a-ce63f8171136.png?resizew=160)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/12/10e54602-744f-4f05-9e8a-ce63f8171136.png?resizew=160)
A.![]() | B.点![]() ![]() |
C.三棱锥![]() | D.若![]() ![]() ![]() ![]() |
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【推荐3】在长方体
中,
,
,则下列结论正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/6b56be7d-1007-4755-9a44-5fe992b44cb2.png?resizew=169)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b37750daa8ba3b3fe3e9e2092f81c848.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d927585a17c2e98ef7d5a9589a26ac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/6b56be7d-1007-4755-9a44-5fe992b44cb2.png?resizew=169)
A.![]() ![]() |
B.平面![]() ![]() |
C.三棱锥![]() |
D.直线![]() ![]() ![]() |
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解题方法
【推荐1】正方体
中,
,
是
的中点,下列说法中错误的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae5a64bcb77f5f64e4af6930c249a270.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
A.![]() ![]() |
B.异面直线![]() ![]() ![]() |
C.若![]() ![]() ![]() ![]() |
D.过![]() ![]() ![]() ![]() ![]() |
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【推荐2】已知四面体ABCD的棱长均为2,则( )
A.![]() | B.直线AB与平面BCD所成的角的正弦值为![]() |
C.点A到平面BCD的距离为![]() | D.两相邻侧面夹角的余弦值为![]() |
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