已知正六棱柱
所有棱的棱长均为1,
面
,则下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/2021/11/13/2850304005734400/2869334766993408/STEM/4a0b5315e4714a32ad8a59ba9a5171b3.png?resizew=261)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/858be9a2f30a22cfdebeaa5bf2e45b4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c62f104ac1221dd48dbe0467495ba70b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e43f82184bef37e57b13c770e4cabc17.png)
![](https://img.xkw.com/dksih/QBM/2021/11/13/2850304005734400/2869334766993408/STEM/4a0b5315e4714a32ad8a59ba9a5171b3.png?resizew=261)
A.![]() | B.直线![]() ![]() ![]() |
C.![]() | D.![]() ![]() |
更新时间:2021-12-11 01:17:40
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【推荐1】“奔驰定理”因其几何表示酷似奔驰的标志得来,是平面向量中一个非常优美的结论,奔驰定理与三角形四心(重心、内心、外心、垂心)有着神秘的关联,它的具体内容是:已知
是
内一点,
的面积分别为
,且
,则以下命题正确的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb90417652d97e7c3f5a6d5926a7d48f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ccb3de366206f32e0c9045e63b2e205.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b63a8338380587c4466483cc9b2fd2bb.png)
A.若![]() ![]() |
B.若![]() ![]() ![]() |
C.若![]() ![]() ![]() |
D.若![]() ![]() ![]() ![]() ![]() |
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【推荐2】在
中,角
所对边分别为
.已知
,下列结论正确的是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f907000528eb336fb3368d44de4419.png)
A.![]() | B.![]() |
C.![]() | D.若![]() ![]() ![]() |
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【推荐1】已知正方体
的棱长为
,
,
,其中
,
,则下列说法中正确的有( )
![](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/5ddcc0295e334717dff21aaa3bf0dbf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcedb75163ea581a8d72b4f5c24af951.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee72261f6901e62dfd0ffe547406544.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34e2e01346f60857ff635bb766802e57.png)
A.若![]() ![]() ![]() | B.若![]() ![]() ![]() |
C.存在![]() ![]() ![]() | D.存在![]() ![]() ![]() |
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【推荐2】如图,在直三棱柱
中,
,
,
为
的中点,过
的截面与棱
、
分别交于点
、
,则下列说法中正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/13/105894e9-02bf-4ce6-a3ca-6eb399e8fcda.png?resizew=222)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ed8f7d3d7043d4b1eb98fc5c4e2fcd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e96a6b20a35af7755e5d90789ea862da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/13/105894e9-02bf-4ce6-a3ca-6eb399e8fcda.png?resizew=222)
A.存在点![]() ![]() |
B.线段![]() ![]() |
C.当点![]() ![]() ![]() ![]() |
D.设截面![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
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【推荐1】在边长为2的正方体
中,M,N分别是BC,
的中点,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
A.AM与![]() |
B.![]() |
C.点![]() ![]() |
D.若点Q为线段![]() ![]() ![]() |
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【推荐2】如图所示的八面体的表面是由2个全等的等边三角形和6个全等的等腰梯形组成,设
,
,有以下四个结论,其中正确的结论是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/17/506a5e8d-af1f-42c2-9411-3caaaf4f7263.png?resizew=152)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab1bdb08d371f24f7b4aeae53f292050.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/17/506a5e8d-af1f-42c2-9411-3caaaf4f7263.png?resizew=152)
A.![]() ![]() |
B.![]() ![]() |
C.该八面体的体积为![]() |
D.直线![]() ![]() ![]() |
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【推荐3】如图,长方体
中,
,点
是半圆弧
上的动点(不包括端点),点
是半圆弧
上的动点(不包括端点),则下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffe10ef728572ce029a0298e4b0e90d7.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed41d321f4c0717ac5b443aad942d9a7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/21/b0ca3b47-3990-42ab-a0ed-c5ac9514c8d2.png?resizew=136)
A.![]() ![]() |
B.若![]() ![]() ![]() ![]() |
C.![]() ![]() |
D.若三棱锥![]() ![]() ![]() |
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【推荐1】如图,在棱长为2的正方体
中,点
分别为
的中点,
为面
的中心,则以下命题正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7beb3b41f243ab66df61975d712428fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
A.平面![]() ![]() |
B.四面体![]() ![]() |
C.四面体![]() ![]() |
D.若点![]() ![]() ![]() ![]() ![]() ![]() ![]() |
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【推荐2】在菱形
中,
,将菱形
沿对角线
折成大小为
的二面角
,四面体
内接于球O,下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f9b0e2a09c7cddb40cea36cbade9b0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0c779e90616a493fc5ed952c56187a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c909cd1b6f3fa1ec39eb245e8f5c11c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
A.四面体![]() |
B.四面体![]() ![]() |
C.当![]() ![]() ![]() ![]() |
D.当![]() ![]() |
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【推荐3】已知
、
分别为棱长为2的正方体
棱
、
上的动点,则下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22adbc0da438220f9cace11b629d799b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
A.线段![]() |
B.三棱锥![]() ![]() |
C.直线![]() ![]() ![]() |
D.当![]() ![]() ![]() ![]() ![]() |
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