1 . 函数
,则
=______ .
![](https://img.xkw.com/dksih/QBM/2016/2/23/1572492479053824/1572492484435968/STEM/17053537a858407191a9a637315f8177.png?resizew=308)
![](https://img.xkw.com/dksih/QBM/2016/2/23/1572492479053824/1572492484435968/STEM/818c73db41304c20ab913dc980541c5c.png?resizew=40)
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2 . 某单位有A,B,C,三个工作点,需要建立一个公共无线网络发射点O,使得发射点到三个工作点的距离相等,已知这三个工作点之间距离分别为
假定A,B,C,O,四点在同一平面内.
(1)求
的大小;
(2)求点O到直线BC的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5aff4815c8fdccd20ba5f366f396b7d0.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e240b05580707212ae7ed3871d7e29c3.png)
(2)求点O到直线BC的距离.
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14-15高三上·辽宁大连·期中
解题方法
3 . 在
中,已知角
所对的边分别为
,直线
与直线
互相平行(其中
).
(1)求角
的值;
(2)若
,求
的取值范围.
![](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/cb66ef80d2617520eb34e9d607e77b29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f26b5e62774e3cce601b46928ae0f73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6a2ba6bbfce0686ee594673d681b687.png)
(1)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/806833fdba04363e22d297a5639f3432.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c28f29ca9b5ba01864a490211fd741b.png)
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11-12高一下·贵州遵义·期中
4 . 在
中,角
所对的边分别为
且满足![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d464cfa11315c41fced11c42d4f9e132.png)
(1)求角
的大小;
(2)求
的最大值,并求取得最大值时角
的大小.
![](https://img.xkw.com/dksih/QBM/2014/12/29/1571939475161088/1571939481075712/STEM/abea88391f0f4387b9c68b31b77bd873.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/d464cfa11315c41fced11c42d4f9e132.png)
(1)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)求
![](https://img.xkw.com/dksih/QBM/2014/12/29/1571939475161088/1571939481075712/STEM/42485457f85348b3ad7ab3ca0d45f39f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
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14-15高二上·贵州遵义·期末
5 . 已知函数
(
),
(0<x<4),
的图像所有交点的横坐标之和为__________ .
![](https://img.xkw.com/dksih/QBM/2014/7/23/1571822255906816/1571822261592064/STEM/3564f08b7a204f31b329fb8510304da6.png?resizew=84)
![](https://img.xkw.com/dksih/QBM/2014/7/23/1571822255906816/1571822261592064/STEM/0d4085afaacd439d9f1ee9a30278e422.png?resizew=45)
![](https://img.xkw.com/dksih/QBM/2014/7/23/1571822255906816/1571822261592064/STEM/db4b9c8d95ec444492ecf3a04851f68c.png?resizew=120)
![](https://img.xkw.com/dksih/QBM/2014/7/23/1571822255906816/1571822261592064/STEM/7b96e82c251845119dd7329a425777fa.png?resizew=129)
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6 . 已知![](https://img.xkw.com/dksih/QBM/2016/2/23/1572492479053824/1572492484476928/STEM/315c39f6484c422a8f8b18a8076ec724.png)
(1)求
的值,
(2)求
的值.
![](https://img.xkw.com/dksih/QBM/2016/2/23/1572492479053824/1572492484476928/STEM/315c39f6484c422a8f8b18a8076ec724.png)
(1)求
![](https://img.xkw.com/dksih/QBM/2016/2/23/1572492479053824/1572492484476928/STEM/83c356f08edd4ba98392c628c5aa9c97.png)
(2)求
![](https://img.xkw.com/dksih/QBM/2016/2/23/1572492479053824/1572492484476928/STEM/7c54e51b867449ef8c91aafefb947bc3.png)
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名校
解题方法
7 . 在
中内角A,B,C的对边分别为a,b,c,满足
,
,D为AC上一点且满足 ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8a428233496c5e21f2c20ebaf0c312e.png)
则BD的长为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf4fa8099927f6664057322a1c087142.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/715c3978c454777672e14a72298317a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8a428233496c5e21f2c20ebaf0c312e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05250abe6da85eb0b555948d7dbaf317.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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8 . 已知函数
且函数
在
上有且仅有3条对称轴.下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29cc0188d0d17017839a895a519aae99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23fb90e09994fdc6ab02ed6ba664f31f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b743ba0b998860bb9586d8c983e45baf.png)
A.![]() ![]() |
B.![]() ![]() |
C.![]() ![]() |
D.若![]() ![]() ![]() |
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名校
9 . 已知函数
在
上单调.
(1)若![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12127664a2b33675602275cfce075879.png)
①写出
的一个对称中心;
②求
的值.
(2)若
在
上恰有3个零点,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/321d7c14d11ad1d72fe704b93cbe878e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7ec440191e19ee3902e555c4816096a.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12127664a2b33675602275cfce075879.png)
①写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/074c228ffc7b1e306f8410afe7bc4b5c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57d02269f97ea73ebe6a9d756d3450a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/074c228ffc7b1e306f8410afe7bc4b5c.png)
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名校
解题方法
10 . 在
中,内角A,B,C的对边分别为a,b,c,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ba19f9dbd8a0a559a6844c54a2ae6e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c90282d4a37c9a20620d4bbb0c263cae.png)
(1)求C;
(2)若
,求
周长的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ba19f9dbd8a0a559a6844c54a2ae6e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c90282d4a37c9a20620d4bbb0c263cae.png)
(1)求C;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4580cc037c0c760c728cdbb74a8154c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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