名校
1 . 如图,直角
中,点M,N在斜边BC上(M,N异于B,C,且N在M,C之间).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/1aec8624-2ae9-46f1-bbcd-7648ff323745.png?resizew=169)
(1)若AM是角A的平分线,
,且
,求三角形ABC的面积;
(2)已知
,
,
,设
.
①若
,求MN的长;
②求
面积的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/1aec8624-2ae9-46f1-bbcd-7648ff323745.png?resizew=169)
(1)若AM是角A的平分线,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e3432d20e661779ddcefda76afcc2ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35378828ca211fae49c9a4efc2d61678.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac2ae98eb223b4fe33e53e9d3ba4cc40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6befdc78e8e955a9fed0e0893a8a3194.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/289a5d041c76475437bf2ab8d1169280.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c37d54554f5b3d167c2398fa6698b8b7.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5a9fc2dda89829fa2c610a8fce86d22.png)
您最近一年使用:0次
2020-03-03更新
|
2590次组卷
|
7卷引用:福建省福州屏东中学2020-2021学年高一下学期期中考试试卷数学试题
2 . 已知向量
,
,
,且A为
的内角.
(1)求角A的大小;
(2)若
中,角
,
,
的对边分别为
,
,
,
,
,求边BC上的中线AD的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6045316cdc658a07d4b8bef348a18989.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1be40fb48771488d7f4fbb086b5a5cef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/069da5c624837df29947b7b8bf722097.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(1)求角A的大小;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/486160ebd73a249a96d369f8249cf114.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65f9c88edac18a30697feb5a9956b70b.png)
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