如图,四棱锥
的底面为正方形,
底面
,
,点
在棱
上,且
,点
是棱
上的动点(不含端点).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/2/d8dff831-0567-498d-b9c3-ff5522f3b571.png?resizew=127)
(1)若
是棱
的中点,求
的余弦值;
(2)求
与平面
所成角的正弦值的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91708c4508371f08556e76e31c7cb9ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b3f7b5e484e3d4e1231627ffaa0d3ce.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/2023/5/2/d8dff831-0567-498d-b9c3-ff5522f3b571.png?resizew=127)
(1)若
![](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/1e31edc5b71c488ca9942d70d9298f01.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03428a8f91a5674cb8f54766c165f7e.png)
22-23高二下·江苏常州·阶段练习 查看更多[2]
更新时间:2023-04-26 21:28:42
|
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
解题方法
【推荐1】棱长为2的正方体中,E,F分别是
,DB的中点,G在棱CD上,且
,H是
的中点.
;
(2)求
;
(3)求FH的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22adbc0da438220f9cace11b629d799b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6de2ee944c8c3476e3014050f0e36199.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fec5bd77cfc1313bc200480cc66c766.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d435974639ea2850bb5c21efe64b123b.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615b0e304bc6bf27ad32db1a924fec23.png)
(3)求FH的长.
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解答题-问答题
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(0.65)
名校
【推荐2】如图,正方形
与等腰直角三角形
所在平面互相垂直,
,E,F分别是
的中点,G是
上的点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/4e5e5578-966f-4296-9601-68a3d2482d95.png?resizew=142)
(1)试确定点G的位置;
(2)求
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a8181f7a7fe7f3fac872ce9534f15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cf468f5132e14ee1d8cc766808b11af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/374fe9986ebbc986fc422e514ab93a51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb47c199e760eb50b846f2bab89ab9b8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/4e5e5578-966f-4296-9601-68a3d2482d95.png?resizew=142)
(1)试确定点G的位置;
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16b6c178f909ee8ee16fdb58fd2c5fd1.png)
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解答题-问答题
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适中
(0.65)
名校
解题方法
【推荐1】在四棱锥S—ABCD中,底面ABCD为长方形,SB⊥底面ABCD,其中BS=2,BA=2,BC=λ,λ的可能取值为:①
;②
;③
;④
;⑤λ=3
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/5713d8ff-0229-43ab-b294-3e22cc542282.png?resizew=209)
(1)求直线AS与平面ABCD所成角的正弦值;
(2)若线段CD上能找到点E,满足AE⊥SE,则λ可能的取值有几种情况?请说明理由;
(3)在(2)的条件下,当λ为所有可能情况的最大值时,线段CD上满足AE⊥SE的点有两个,分别记为E1,E2,求二面角E1-SB-E2的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f83464bf17f9d4d9ee6a7f299539871.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b3cf0f585938ede9eca890a6eb326d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f88070c5772370fef9c16727145641d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0b6855ff38858f4c62013c46a0aa3bd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/5713d8ff-0229-43ab-b294-3e22cc542282.png?resizew=209)
(1)求直线AS与平面ABCD所成角的正弦值;
(2)若线段CD上能找到点E,满足AE⊥SE,则λ可能的取值有几种情况?请说明理由;
(3)在(2)的条件下,当λ为所有可能情况的最大值时,线段CD上满足AE⊥SE的点有两个,分别记为E1,E2,求二面角E1-SB-E2的大小.
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解答题-问答题
|
适中
(0.65)
解题方法
【推荐2】如图,在四棱锥
中,底面
是边长为
的正方形,
底面
,
,
为
的中点,
为
的中点,建立适当的空间坐标系,利用空间向量解答以下问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/15/e9237b4d-4815-4098-9252-0bf40e60a704.png?resizew=149)
(1)证明:直线
平面
;
(2)求异面直线
与
所成角的大小;
(3)求直线
与平面
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06a5faf3cbb633fc4294c8ce703c64c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4317430d5a2b61d9a2a88b73e7d7ad39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9774f83067ed956a551bc41adcce0469.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/15/e9237b4d-4815-4098-9252-0bf40e60a704.png?resizew=149)
(1)证明:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f367fb956c36978b6d783e2254c2d4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3201d3796ed9a29338aac25245a7c8e2.png)
(2)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be2e2c0d4ac2bd79f6cea7a9b1a50662.png)
(3)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3201d3796ed9a29338aac25245a7c8e2.png)
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