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1 . 在棱长为2的正方体
中,
分别为棱
和
的中点.
(1)证明:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
平面
;
(2)求异面直线
与
所成的余弦值;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52041559f8fee18bfa3e2e2ac07c3bfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22adbc0da438220f9cace11b629d799b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bb10d645970e5860afd3430957fab6c.png)
(2)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
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解题方法
2 . 在
中,角A,B,C所对的边分别为a,b,c,
.
(1)证明:
;
(2)证明:
;
(3)求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e6576d4d349d7180332d3c2abdeeb51.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8dcad85c5459c1f6b6425c0c43edcd1.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f44c181a2f6ae22d5d52b374768dc57.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2bcb0cf5182f70cf5f2737b709b4a9c.png)
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3 . 如图,在平行四边形
中,
,
,
,将
沿
折起到
,满足
.
平面
;
(2)若在线段
上存在点
,使得二面角
的大小为
,求此时
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b8b98b2f83279a49e94d9f48c5e6f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3ea25ef38e4afa8f75ffd0842890289.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c1ba548d839b5d5cf74bdd6884cd97c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fe052786101dfcc941480919eb2cecc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
(2)若在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb97aff0960e2640314888a38e7169c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64785e4401e1d79632e360fd3626ed62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
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解题方法
4 . 在中,角
所对的边分别为
是
内的一点,且
.
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18c61146a4a82d2ad1cd55429dc40398.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
您最近一年使用:0次
2023-07-05更新
|
393次组卷
|
4卷引用:山西省大同市2022-2023学年高一下学期期中数学试题
5 . 在①
,②
这两个条件中任选一个,补充在下面问题中,并作答.
问题:记
的内角
的对边分别为
,且__________.
(1)证明:
;
(2)若
,求
的取值范围.
注:如果选择多个条件分别解答,按第一个解答计分.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9936660ad4e752fb2455d3fa8caa0b9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5468d321a91311c3e025198e47f6c4e2.png)
问题:记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a2264c134952d41fb9bcb90e6c72c83.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d58dcd555dcb96af6d37ed1b06d581fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
注:如果选择多个条件分别解答,按第一个解答计分.
您最近一年使用:0次
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解题方法
6 . 如图,在梯形ABCD中,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/15/26640d6f-36a6-4429-8cad-82127860557e.png?resizew=162)
(1)求证:
;
(2)若
,
,求梯形ABCD的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea8b0d303c0376f06c02d653aee4d5a3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/15/26640d6f-36a6-4429-8cad-82127860557e.png?resizew=162)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05fccb8041c4caf53dc199b1cba2e062.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9cb21ae875f36d52d0b6f82b0201d0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12143a06ed24558d8cc7ad39961d3e1f.png)
您最近一年使用:0次
2023-05-14更新
|
977次组卷
|
5卷引用:河南省新高中创新联盟TOP二十名校2022-2023学年高一下学期5月调研考试数学试题
河南省新高中创新联盟TOP二十名校2022-2023学年高一下学期5月调研考试数学试题(已下线)模块一 专题3 解三角形(2)(人教B)四川省成都市树德中学光华校区2022-2023学年高一下学期数学测试(六)吉林省四平市实验中学2022-2023学年高一下学期期末数学试题(已下线)重难点突破02 解三角形图形类问题(十大题型)-1
7 . 为了推导两角和与差的三角函数公式,某同学设计了一种证明方法:在直角梯形ABCD中,
,
,点E为BC上一点,且
,过点D作
于点F,设
,
.
(1)利用图中边长关系
,证明:
;
![](https://img.xkw.com/dksih/QBM/2023/6/20/3263775491006464/3265425842176000/STEM/d80ec35b6b4c44ad9d54317146a5675c.png?resizew=47)
(2)若
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7d8397018b0a01a1b4e9574604f9e76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d5427b7b994b860628df3d6b7a07de8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aa30a9ee227af2b387cf6e028c20d7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a447d8fc6919edd758ccec4277435aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21461e9cb1265843a16d379788f3fcb8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/24/b7c91a13-25b3-41d4-9180-c25f2539ec0f.png?resizew=133)
(1)利用图中边长关系
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8904ac51eff2df308ed7b6a07aa2477.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c8b8ee28cf91c5976d074d233c941f3.png)
![](https://img.xkw.com/dksih/QBM/2023/6/20/3263775491006464/3265425842176000/STEM/d80ec35b6b4c44ad9d54317146a5675c.png?resizew=47)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/952ab659a747b410974aa88748f18d0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fff423fa9846e49124710a2add054a8f.png)
您最近一年使用:0次
解题方法
8 . 在
中,角
所对的边分别为
,且
.
(1)求证:
;
(2)求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e301a12295668498196f4533e47797d5.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f44c181a2f6ae22d5d52b374768dc57.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047e95d7b9ba001ed13b0f9b07497481.png)
您最近一年使用:0次
名校
9 . 如图直线
与
的边
分别相交于点D,E.设
,
,
,
.
(1)若
,F为
的外心,求
的值,
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5dc62e10004e73908091338362917da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c884a45b56bc34d79273b067c1520b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e781a2489271bfd1597cba1bb6f5887.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd37b64af6bbdbf18adf222b8a5865ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aad21f3682a4949e36a2c18fac6a5807.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/29/24059aa2-c71f-4263-a3a6-02c2dabc3979.png?resizew=152)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825b4d8a30df3008671b9eae1af54a5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/101392085fd7522233441af6eda74aed.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca5b98ffb5258ca17bc6705972c97113.png)
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10 . 为了求一个棱长为
的正四面体体积,小明同学设计如下解法:构造一个棱长为1的正方体,如图1:则四面体
为棱长是
的正四面体,且有
.学以致用:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/13/7f6e930f-e5a9-4fb1-a52c-5d884c18416e.png?resizew=304)
(1)如图2,一个四面体三组对棱长分别为
,2,
,求此四面体外接球表面积;
(2)若四面体ABCD每组对棱长分别相等,求证:该四面体的四个面都是锐角三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68ac02c2f91cadb1e328bc6ab9b9c491.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff5e6b8c4de00d7e01238f7a32c19429.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/13/7f6e930f-e5a9-4fb1-a52c-5d884c18416e.png?resizew=304)
(1)如图2,一个四面体三组对棱长分别为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
(2)若四面体ABCD每组对棱长分别相等,求证:该四面体的四个面都是锐角三角形.
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