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1 . 在四棱锥
中,底面ABCD是菱形,
,
平面ABCD,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/19/0b8ff67d-f743-4128-acf5-3928c2b0d02f.png?resizew=164)
(1)求证:
;
(2)求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f83a04565a8ebaa111894b724b0ba266.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/19/0b8ff67d-f743-4128-acf5-3928c2b0d02f.png?resizew=164)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e4125524caac016727c80d2722c5ba3.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1636b4530c0b42d0e0b649e90e3b9e85.png)
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3卷引用:福建省三明第一中学2021-2022学年高一下学期期中学段考试数学试题
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解题方法
2 . 如图,平面四边形ABCD中,
,则四边形ABCD的面积的最大值为___________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17ca576fdf4bb42a94d859d67a3deb01.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/985a48c8-0616-4e01-add3-b8925c68cc30.png?resizew=162)
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3 . 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![]() |
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4 . 已知
的内角A、B、C所对的边分别为a、b、c,下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
A.若![]() ![]() |
B.若![]() ![]() |
C.若![]() ![]() |
D.若![]() ![]() |
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5 . 已知正四面体的棱长为
,则该正四面体的体积___________ ,其内切球的半径为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95bacae35b6e16a0a33c2bdc6bc07df7.png)
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6 . 如图,梯形ABCD中,
,过A作
于E,沿AE把ADE折起,设D折起,设点D折起后的位置P,且
.
![](https://img.xkw.com/dksih/QBM/2022/5/6/2973606771539968/2978047273091072/STEM/f8cd9e52-5c76-4c05-95aa-cfe5278d7114.png?resizew=351)
(1)求证:平面
平面PBC;
(2)在棱PC上是否存在一点F,使直线
平面PAE?并说明理由;
(3)设平面
平面
直线l,求直线l与平面ABCE所成角的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4611ceb2a28f7a7e4d24266d7f99b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7cb4911e6ac947c4cf8ebd1fb1dd552.png)
![](https://img.xkw.com/dksih/QBM/2022/5/6/2973606771539968/2978047273091072/STEM/f8cd9e52-5c76-4c05-95aa-cfe5278d7114.png?resizew=351)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90d96357a07048ba79b8c84097d359d9.png)
(2)在棱PC上是否存在一点F,使直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4d888c0b616792a2c41ff180de99fbb.png)
(3)设平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19935937a052056fa154e508a6c9798b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/050304e29c2eea3064202a1af72350a7.png)
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7 . 已知a,b为两条直线,
为两个平面,则下列结论正确的( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e288596fa3811dd2c17bded60e82e7.png)
A.若![]() ![]() |
B.若![]() ![]() |
C.若![]() ![]() |
D.若![]() ![]() |
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8 . 集美中学高101组高二(15)班小美同学通过导数的学习,对直线与曲线相切产生浓厚兴趣,并试着定义:若曲线
与曲线
存在公共点
,且
、
在点
处的切线重合,称曲线
与
相切.现出一问题:若函数
与
相切,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da53929a8f67b9aa3827fdbd73ebd265.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eda90af8ba1d6f9e21a49e96b709f16c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
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9 . 如图为一块边长为8km的等边三角形地块
,为改善市民生活环境,当地政府有计划对这块地进行改造,在
、
、
上分别选取点D、E、F使
,在四边形区域
内种植草坪,其余区域修建停车场,设
.
![](https://img.xkw.com/dksih/QBM/2022/5/2/2970981422481408/2978035831840768/STEM/dbfe3540-4f45-4527-b6e6-52f5e6f76e5a.png?resizew=145)
(1)当D为
中点且
时,求草坪的面积;
(2)若在改造的过程中,因实际需要,D与B、C的距离都不少于2km,求草坪的面积的最大值,并求出此时
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f3bba5bd11e850c9b766c2ba6c426d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48a61d8bedef61745ee4fd89a8c0c119.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0b0668257abc308c6d23354ab663814.png)
![](https://img.xkw.com/dksih/QBM/2022/5/2/2970981422481408/2978035831840768/STEM/dbfe3540-4f45-4527-b6e6-52f5e6f76e5a.png?resizew=145)
(1)当D为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c69a23d106fd34aa17b22e9c9a8de36.png)
(2)若在改造的过程中,因实际需要,D与B、C的距离都不少于2km,求草坪的面积的最大值,并求出此时
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cc9750c313ee972124cb62c4a6fb7ea.png)
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10 . m,n是空间中不同的直线,
,
,y是不同的平面,则下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
A.若![]() ![]() ![]() ![]() |
B.若![]() ![]() ![]() ![]() |
C.若![]() ![]() ![]() |
D.若l,m是两条异面直线,且![]() ![]() ![]() ![]() ![]() |
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659次组卷
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2卷引用:福建省福州第一中学2021-2022学年高一下学期期中考试数学试题