2023高三·全国·专题练习
解题方法
1 . 如图,已知
,
,
.证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5986f2991d45fbf3578f08f27d9fd7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10db72229e58b757205b0614e7c279da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7f792f6f2cb15d2e4e6d2764b139085.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73f345365fe0a1986b80299f7a99a306.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/20/05390a15-b320-4094-9f70-f0facc87fcc9.png?resizew=171)
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2023高三·全国·专题练习
解题方法
2 . 如图,在三棱锥
中,
为
的中点,
,
,
,
,
,
.证明:
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/036de574712cad14bddadf6653c7e714.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26a42b05e06fe34d66538930787bb3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a403d69f1eabe95c948fbde11a3ab719.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7767d492158189b23af332a8016ed37d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/20/305d5d1e-6b65-41e2-9e3e-1d5df930e5bb.png?resizew=185)
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2023高三·全国·专题练习
解题方法
3 . 已知正方体
.求证:
⊥平面A1D C.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83c09eec4e14a861af83d7828797d176.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/3/58e64259-1b9e-4ef5-a94a-d3fc49e26e57.png?resizew=167)
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2023高三·全国·专题练习
解题方法
4 . 空间中直线l和三角形的两边
,
同时垂直,则这条直线和三角形的第三边
的位置关系是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
A.平行 | B.垂直 | C.相交 | D.不确定 |
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2023高三·全国·专题练习
解题方法
5 . 在三棱锥
中,点P在平面ABC中的射影为点O.
(1)若PA=PB=PC,则点O是△ABC的______ 心.
(2)若PA⊥PB,PB⊥PC,PC⊥PA,则点O是△ABC的______ 心.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
(1)若PA=PB=PC,则点O是△ABC的
(2)若PA⊥PB,PB⊥PC,PC⊥PA,则点O是△ABC的
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2023高三·全国·专题练习
6 . 如图,在四棱锥
中,底面
为平行四边形,AC与BD交于点O,
平面
,
,
,
,CP与平面
所成角的正切值为
.
(1)证明:
平面
;
(2)若S是棱PA上靠近点
的三等分点,求直线BS与平面
所成角的正弦值.
![](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/f3e126c16032892966489053f44b9048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d783fe7f3ce673d5d21281174e7a7968.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b3bd7fcc7124307e9c33f98c53f2edf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6183ebae6c95c17a4e0ab017e12ae8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/19/81d8b61f-20a8-4eb3-b0f2-7c60a3879d4b.png?resizew=192)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca5dd496ee0c1170ef6dcc48266ee444.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
(2)若S是棱PA上靠近点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1b489c25405ce48699d4f0a62820bed.png)
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7 . 如图,四棱锥
中,
底面
,底面
为正方形,则下列结论正确的是( )
![](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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/18/5407a1c4-5000-438d-b749-723463c66dac.png?resizew=151)
A.![]() | B.平面![]() |
C.平面![]() | D.平面![]() |
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8 . 如图,在四面体
中,
分别是线段
的中点,
.
(1)证明:
平面
;
(2)是否存在
,使得平面
与平面
的夹角的余弦值为
?若存在,求出此时
的长度;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28a77aa6c27acfffcc601d9ca7e6d4c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c545841013f55b10e2c93943618fe776.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/20/938e0e2b-b4f4-4e97-bdb6-f44e8c097fb1.png?resizew=147)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a5f445af1ae136773cb338920552ff2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
(2)是否存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c66d99a6a8415ddad22bbed33b64cfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/500df0e782bb081e608f4bc1d576afcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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名校
9 . 已知四边形ABCD是等腰梯形(如图1),
,
,
,
将
沿DE折起,使得
(如图2),连接AC,AB,设M是AB的中点.下列结论中正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8e2a44d05b1d387150c4b359e021ffc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1a572636ed4d26d323092ff0fc06f42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4974d70f732b3dea42537def43e2faf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b29f27c9a3af7044faf147bdaeb3fe81.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/18/c005233e-1001-45e3-b3d0-3fae5a40133b.png?resizew=327)
A.![]() |
B.点D到平面AMC的距离为![]() |
C.![]() |
D.四面体ABCE的外接球表面积为![]() |
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2023-10-02更新
|
533次组卷
|
2卷引用:江苏省连云港市灌南高级中学2022-2023学年高一下学期第二次月考数学试题
名校
解题方法
10 . 如图,在三棱锥
中,
平面
分别为棱
的中点.
(1)证明:
;
(2)若
,二面角
的余弦值为
,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7464ba1425bf97d947151bdbb16dd9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89d4b113b22890bc910fa4502812f8e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/2/0b24e584-706b-4dde-a10a-db6cb36b3e5b.png?resizew=162)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34b416412f982d9c6956b2229d6e3729.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e97845c5fc581f5d6cf9587c8c436a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/141df7ba990794bca216541dfe4ccc55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3084250c16aa160cb58887bcf6e96448.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
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