1 . 证明下列命题:
(1)设
,证明:
;
(2)求证:
.
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af36a3b0f5f36d3e70d5af4b2de6bd44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ef3052cd1be7641eb559c5d7ed142cb.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17128233746c2e7cf4f8016131ef3801.png)
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2 . (1)证明:若
,
,则
;
(2)已知
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/061813f1ec633c5c4c393c4de7938322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1cebd1251c1a7258367fc4c3542e240.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1667ed221b04596de900dc9223e192e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21bbcd66efd2cadc95b0b9373aefbfb1.png)
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解题方法
3 . 已知
的内角A,B,C的对边分别为a,b,c,且
.
(1)证明:C为锐角.
(2)若
的面积为3,
,且
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c256c79e8c4c18fc669412ede195d9.png)
(1)证明:C为锐角.
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bf4c55e68427cca325cfbddedcf84eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0efdce759b9a86d5be2c14b95ae7680b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d6fc9b90f370fbb27552876b650f8f.png)
您最近一年使用:0次
2024-06-17更新
|
201次组卷
|
3卷引用:云南省部分校2023-2024学年高二下学期月考联考数学试题
名校
解题方法
4 . 记
的内角A,B,C的对边分别为a,b,c,已知
.
(1)证明:
;
(2)若
,
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f73789e156d750cb54fe27ce4b04712.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a70d8f920d57c9c3f9cbffaf45c4055.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65397f11ea8af736f38debadf420c4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc8c65bea2c80af038768b74250c694e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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5 . 当
时,求证:
,
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2331b616e0ccfb9ce96e52c4ad50ea53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0132f586547d8a9c9928091f92d0544d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b982e9a3ee26fe2a3d0671cf0e07917.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8357fe57246a20aa36d9a43119add9a.png)
您最近一年使用:0次
名校
解题方法
6 . 在三角形
中,角
所对的边长分别为
,且
.
(1)证明:
;
(2)若
,
,求三角形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.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/4f8e2f6effaef85b59ecbfb14b7e7d42.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8baeadf41a4338e94e6e50d5ab8ec1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf2d3c6d20ec680b233344a0be893ef4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2671f3e6bb4374578bcd5d35fb358840.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
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7 . 求证:
(1)
;
(2)
;
(3)
;
(4)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fa937ccb146dae977cb55510f4d5042.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fab8647d21551f167d68b305179c37ed.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11c58a6ee2ea78be2d62f5c182c04326.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f15c3e2158bdc118bb5ef2c9c16b5eb5.png)
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8 . 求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1025c09a3b71630c2a3fd665be85a8c.png)
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9 . 证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea6d9671da178f8173d1c44e6178d04e.png)
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10 . 求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab7a1173c52033ffccec53bc93b85f9e.png)
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