已知正方体
的棱长为2,点E,F,G分别为
的中点,则下列结论正确的是( )
![](https://img.xkw.com/dksih/QBM/2022/5/6/2973606771539968/2978047272697856/STEM/01598576-0aa7-4520-8f1e-3ac7c00165d3.png?resizew=161)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/473ce0e22c4edc6ef768e0c12f59e483.png)
![](https://img.xkw.com/dksih/QBM/2022/5/6/2973606771539968/2978047272697856/STEM/01598576-0aa7-4520-8f1e-3ac7c00165d3.png?resizew=161)
A.![]() |
B.![]() |
C.平面AEF截正方体所得的截面面积为![]() |
D.平面AEF截正方体所得上下两部分几何体体积之比为![]() |
更新时间:2022-05-12 22:35:35
|
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适中
(0.65)
解题方法
【推荐1】如图,在棱长为
的正方体
中,点
为线段
上的动点,则( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/30/797c7588-0c37-4534-aed3-fb3f4302153e.png?resizew=172)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/30/797c7588-0c37-4534-aed3-fb3f4302153e.png?resizew=172)
A.三棱锥![]() |
B.过![]() ![]() ![]() |
C.过![]() ![]() ![]() |
D.三棱锥![]() ![]() |
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解题方法
【推荐2】已知正方体
,过对角线
作平面
交棱
于点
,交棱
于点
,则:
①平面
分正方体所得两部分的体积相等;
②四边形
一定是平行四边形;
③平面
与平面
不可能垂直;
④四边形
的面积有最大值.
其中所有正确结论的序号为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe734023d4e70010a6b2cc3267cb86e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
①平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
②四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ef5ea43614d815c3abb27a42dfb101b.png)
③平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1477ae90a240deba97f8dadf4d7c41aa.png)
④四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ef5ea43614d815c3abb27a42dfb101b.png)
其中所有正确结论的序号为( )
A.① | B.② | C.③ | D.④ |
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解题方法
【推荐1】在正方体中,点P满足
,其中
,
,则下列说法正确的是( )
A.当![]() ![]() ![]() |
B.当![]() ![]() |
C.当![]() |
D.当![]() ![]() ![]() ![]() |
您最近一年使用:0次
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解题方法
【推荐2】如图,棱长为2的正方体
中,
在线段
(含端点)上运动,则下列判断正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/9780746a-7ec9-448d-ae5b-099b7eec9183.png?resizew=175)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/9780746a-7ec9-448d-ae5b-099b7eec9183.png?resizew=175)
A.![]() | B.三棱锥![]() ![]() |
C.![]() ![]() | D.![]() ![]() ![]() |
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【推荐1】如图,正三棱柱
中,
,点
为
中点,点
为四边形
内(包含边界)的动点,则以下结论正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/1da9e026-013f-490d-ae32-f6e9a9bc1a8a.png?resizew=191)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/373d267302e0fc66360b5ce375805494.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/1da9e026-013f-490d-ae32-f6e9a9bc1a8a.png?resizew=191)
A.![]() |
B.若![]() ![]() ![]() ![]() |
C.直线![]() ![]() |
D.若点![]() ![]() ![]() ![]() |
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【推荐2】如图所示,已知正方体
的棱长为2,线段
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,
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
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A.平面![]() ![]() ![]() |
B.存在点![]() ![]() ![]() ![]() ![]() |
C.当![]() ![]() |
D.三棱锥![]() |
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【推荐1】在正方体
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是正方形
内一动点(含边界),则下列说法中不正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632f2bf1cd0435041fa04b01901d1c8c.png)
A.![]() |
B.存在点![]() ![]() ![]() |
C.存在点![]() ![]() ![]() |
D.平面![]() |
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解题方法
【推荐2】已知几何体
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A.![]() ![]() |
B.在直线![]() ![]() |
C.![]() ![]() |
D.在直线![]() ![]() ![]() |
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解题方法
【推荐3】如图,在矩形
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与点
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卷成以
为母线的圆柱的侧面,使线段
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A.直线![]() ![]() | B.![]() ![]() |
C.直线![]() ![]() | D.点![]() ![]() ![]() |
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