1 . 在锐角△ABC中,a,b,c分别为角A,B,C,若
,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/696bf7c8ee1492b2ad2bb74d28ea8d49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc7407d82d6e55b969d34e937ce36f3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93787e657f90e57b6bdc096efc034fc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
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2卷引用:江西省南昌市第十九中学2021-2022学年高一下学期第三次月考数学试卷
2 . 在
中,角A,B,C所对的边分别为a,b,c,若
,
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23725094c363fd158166a8698971694c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec21ee73ebbc19ad8162f9784256581.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73d8e1a7314389c48d4d9cff64742020.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
A.8 | B.6 | C.5 | D.3 |
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解题方法
3 . 如图,锐角
中,
,延长
到
,使得
,
,
.
![](https://img.xkw.com/dksih/QBM/2022/4/27/2967030070444032/2968496619134976/STEM/fe0b7887-dfdd-4463-b318-51ed2f1249de.png?resizew=189)
(1)求
;
(2)求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fca3734de79f7f50b552ef62b29dc7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70dc2c20619a4fc12a0cfda59af5b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8917dc13ed1b7999dba24a59b35e0de4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96791b1c2d5a9c569dc7c98fc3fb45ee.png)
![](https://img.xkw.com/dksih/QBM/2022/4/27/2967030070444032/2968496619134976/STEM/fe0b7887-dfdd-4463-b318-51ed2f1249de.png?resizew=189)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d06334bfc297b20ffa8fee33bfb6e05.png)
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解题方法
4 . 如图所示,三棱锥
中,
,
,且
,
,
,M是
中点,
,E是
的中点,则异面直线
与
所成角的余弦值为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/94bd6ba9-c69b-49f7-aa3b-2c9bae79b6bb.png?resizew=180)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83640592853a53872d7af69c0cffc1bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/036de574712cad14bddadf6653c7e714.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/491c3a4f72b84ebadd28b90711435adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b91e39751a571b4e0e65a0dc110891.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/018174a8cb9f47606b187a69850481da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/94bd6ba9-c69b-49f7-aa3b-2c9bae79b6bb.png?resizew=180)
A.![]() | B.![]() | C.![]() | D.![]() |
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2卷引用:江西省南昌市第十中学2021-2022学年高二下学期期中考试数学(理)试题
名校
解题方法
5 . 在
中,角
的对边分别是
.下面四个结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38335830b93ac4d99c28a8e209eecb3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7f5573b30734d65648f61c0a94c98de.png)
A.![]() ![]() | B.若![]() ![]() |
C.在![]() | D.已知![]() ![]() |
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名校
6 . 赵爽是我国古代著名的数学家,大约在公元222年,赵爽为《周髀算经》一书作序时,介绍了“勾股圆方图”,亦称“赵爽弦图”(以弦为边长得到的正方形组成),如图(1)类比“赵爽弦图”,可类似地构造如图(2)所示的图形,它是由3个全等的三角形与中间的一个小等边三角形拼成的一个大等边三角形,设
,则图中阴影部分与空白部分面积之比为( )
![](https://img.xkw.com/dksih/QBM/2022/4/13/2957283756580864/2958142467284992/STEM/a4dc7cb408a2451db46c74f32643a218.png?resizew=257)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25e5b4ac18aa3fb858c72ee906345a7a.png)
![](https://img.xkw.com/dksih/QBM/2022/4/13/2957283756580864/2958142467284992/STEM/a4dc7cb408a2451db46c74f32643a218.png?resizew=257)
A.![]() | B.![]() | C.![]() | D.![]() |
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5卷引用:江西省南昌市第十中学2022届高三下学期高考仿真模拟考试(一)数学(理)试题
7 .
中,角
所对的边分别是
,下面判断错误的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e30c0a5c92f50dce1f7624709950ff5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0ec18aa8ab6f4a4e70722e4df77c9c1.png)
A.若![]() ![]() |
B.若![]() ![]() |
C.![]() ![]() ![]() ![]() |
D.![]() ![]() |
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解题方法
8 . 在
中,角A,B,C所对的边分别为a,b,c.
(1)若
,且
,求
;
(2)若
,D是边AC上一点,
,
,且
.求BD的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b054856d8098e2501799bf1cf6f65e87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da685598035a4dd082902ed342074b03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c32e2f2d7147cf1699fbfdef9cf4af74.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcdb7a488910743dc5c63afb394b87e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3f157aab917082b835f4213ed81a3bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d0b3334e3951f8117bff4f20a0a0d97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e13c772461aef1d9d715129636739748.png)
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4卷引用:江西省南昌市第二中学等十五所名校2022届高三下学期第一次模拟考数学(理)试题
江西省南昌市第二中学等十五所名校2022届高三下学期第一次模拟考数学(理)试题湘赣皖长郡十五校2022届高三下学期第一次联考理科数学试题(全国乙卷)(已下线)2022年全国高考乙卷数学(文)试题变式题9-12题(已下线)2022年全国高考乙卷数学(文)试题变式题17-20题
名校
解题方法
9 . 在三棱锥
中,
为正三角形,
,
,E为AB的中点,F为PC的中点,
,
,则三棱锥
外接球的表面积为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab2c27eac56fffa4cd7dbe1dcdf1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/533205f32369f31adfeba25dfd422955.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2899e607479d8d1c47d954ae9ebb7144.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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江西省南昌市第二中学等十五所名校2022届高三下学期第一次模拟考数学(理)试题湘赣皖长郡十五校2022届高三下学期第一次联考理科数学试题(全国乙卷)(已下线)查补易混易错点06 立体几何-【查漏补缺】2022年高考数学(理)三轮冲刺过关贵州省铜仁第一中学2023-2024学年高二上学期8月摸底衔接质量检测(二)数学试题
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10 . 在
中,A,B,C所对的边分别为
,
,
,
,若
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e47d64e9a0fa56d9d547b670cc9efaa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31b117c0e2c7a70c00ad56675598f77f.png)
A.角![]() | B.![]() |
C.![]() | D.![]() |
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