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1 . 在
中,∠A,∠B,∠C的对边分别为a,b,c,若bcos C=(2a-c)cos B,
(1)求∠B的大小;
(2)若b=
,a+c=4,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(1)求∠B的大小;
(2)若b=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/619096595112f0340a43b756e114dd3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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7卷引用:宁夏青铜峡市宁朔中学2023届高三上学期开学考试数学(文)试题
名校
解题方法
2 . 已知
的内角A、B,C所对的边分别为a,b,c,若
,且
,
(1)求A;
(2)若
是
边上的中线,求
长度的最大值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa4c355f11471a38f5583a434a1ddeb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/682c888dc7810ddc6ee52b94493dcc07.png)
(1)求A;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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3卷引用:福建省福州第一中学2023届高三上学期开学质检考试数学试题
3 . 在平面四边形
中,
,
,
,
,
,则
_________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eee296a7d9fba487f1485c61580196f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d3c9ce32b721995f355eea411340e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00ec435aa1401dbce7863b531bf2f3e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae248960d8c1677cf948f8251275e863.png)
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解题方法
4 . 如图,已知
平面
,
,
,则
等于( )
![](https://img.xkw.com/dksih/QBM/2022/9/2/3057960843853824/3064402528657408/STEM/c4aaaeb8397a434898d7f1a7c22242d4.png?resizew=184)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e918b70b02a73685e3c536c7f380e2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00a12c329c8e33dcc0ad51f7557e2d2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/2022/9/2/3057960843853824/3064402528657408/STEM/c4aaaeb8397a434898d7f1a7c22242d4.png?resizew=184)
A.![]() | B.![]() | C.![]() | D.![]() |
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5卷引用:福建省三明市第二中学2022-2023学年高二上学期开学适应性练习数学试题
解题方法
5 . 已知点F为双曲线C:
(
,
)的左焦点,过点F且斜率为1的直线交C于A,B两点,若
,则C的离心率为_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f3fa0b40fb0d9b8c62e37316ab3b04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ca5fd57c2c2fcc3c7a574fdd1467d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dd06836b7b5adcbef9281d33363d96c.png)
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解题方法
6 . 已知在
中,内角A,B,C所对的边分别为a,b,c,且
,
.
(1)求
的值;
(2)若
的面积为
,求
的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ab1c19b66cda3fb899f06d9a25e973c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a93984cfe562f16c479d1d1885892e3.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1075d972439d6a0fbbc04cf439257d5.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84e4123975f257306440158659634c4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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2卷引用:江西省省重点校联盟2022-2023学年高二上学期入学摸底联考数学试题
解题方法
7 . 已知
的面积为12.再从条件①、条件②这两个条件中选择一个作为已知,使
存在.
(1)求b与c的值;
(2)求
的值.
条件①:
,
;条件②:
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(1)求b与c的值;
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00a36a3109ebcb0045c1bba6d4da81a2.png)
条件①:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2fd1e7b23db81e1cd71ac666322672f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b8bb2700d35203dcf8d266f1b5c18b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab839d8569171afab5ed55c22013aa72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8a0d84bfaa9f1d614136f17f02e6e31.png)
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8 . 在
中,若
,
,
,则
的值可以为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5742b2684d00be50a66e01c9acb6b51f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb5bac75f36bb1dc5c8190d4dbe681d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7a74c3e9a8f3f11e98b4fa659a97679.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
A.![]() | B.![]() | C.2 | D.4 |
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解题方法
9 . 如图,四棱锥
的底面BCDE是平行四边形,
,
,
,点F,G分别为棱BE和CD的中点,
.
![](https://img.xkw.com/dksih/QBM/2022/9/2/3058024714117120/3064171451334656/STEM/d0489a0d6f9a4efc950650f9f2f652c6.png?resizew=306)
(1)证明:平面
平面BCDE;
(2)若
,求过点G且平行于平面ABC的平面截四棱锥
所得截面多边形的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5164a3cc47e266446d49127e2ef10c37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4a531df73228cfda5c1382f45fb8c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/713d4e968d4852e0258aa1307f5d47f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48a277db452e76240ec83ec6a2864bdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/876bb8ce0ca53475fa091ffd18bdc94a.png)
![](https://img.xkw.com/dksih/QBM/2022/9/2/3058024714117120/3064171451334656/STEM/d0489a0d6f9a4efc950650f9f2f652c6.png?resizew=306)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed5f0cfc1049f84a04c81bd213afb8d9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5164a3cc47e266446d49127e2ef10c37.png)
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解题方法
10 . 已知
的内角A,B,C的对边分别为a,b,c,且
.
(1)证明:
;
(2)记
的面积为S,若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce175bb3e01fd5d499c31fb55168f24.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be4a570e7b3e4dfff30ef2ad943bf56f.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94ffc5070f3a9820464740ad4f5e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd1810555c0c28fe352841322b85bbc6.png)
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4卷引用:江西省智慧上进2023届高三上学期入学摸底考试数学(文)试题
江西省智慧上进2023届高三上学期入学摸底考试数学(文)试题江西省智慧上进2023届高三上学期入学摸底考试数学(理)试题(已下线)第09讲 拓展四:三角形中周长(定值,最值,取值范围)问题 (高频考点精讲)陕西省西安市长安区第一中学2022-2023学年高三上学期第一次质量检测文科数学试题