名校
1 . 如图,在棱长为
的正方体
中,点
在线段
(不包含端点)上,则下列结论正确的有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/12/f5915e45-9e0d-4933-814d-aea18097ff37.png?resizew=164)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](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/0f1f229274a6e17977cc047814212589.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/12/f5915e45-9e0d-4933-814d-aea18097ff37.png?resizew=164)
A.点![]() ![]() ![]() |
B.直线![]() ![]() |
C.异面直线![]() ![]() ![]() |
D.三棱锥![]() ![]() |
您最近一年使用:0次
2023-12-12更新
|
247次组卷
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2卷引用:江西省赣州市南康中学2024届高三上学期七省联考考前数学猜题卷(四)
名校
2 . 如图,在四棱锥
中,底面
是边长为2的菱形,
,
是正三角形,
为线段
的中点,点
为棱
上的动点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/5694b0d5-c7e0-4245-9102-23089157ed41.png?resizew=183)
(1)求证:平面
平面
;
(2)若平面
平面
.
①当点
恰为
中点时,求异面直线
与
所成角的余弦值;
②在平面
内确定一点
,使
的值最小,并求此时
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55a675310c8ba418e5a59beb7317e21e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/5694b0d5-c7e0-4245-9102-23089157ed41.png?resizew=183)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78a3fd5284e160896f07ce367645fd04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64eb31601464364be2baf4aa87404bcd.png)
(2)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
①当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
②在平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64eb31601464364be2baf4aa87404bcd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb64f6a63cc7cf145b0e8de061491117.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/212fafcdb754da6728a8b06fded23955.png)
您最近一年使用:0次
2022-07-16更新
|
1155次组卷
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4卷引用:江西省龙南中学2022-2023学年高一下学期6月期末考试数学试题
名校
解题方法
3 . 在正四棱锥P-ABCD中,PA=2,直线PA与平面ABCD所成角为60°,E为PC的中点,则异面直线PA与BE所成角的大小为___________ .
您最近一年使用:0次
2019-09-20更新
|
388次组卷
|
4卷引用:江西省赣州市赣县中学北校区2019-2020学年高二上学期月考数学(文)试题