名校
解题方法
1 . 已知
.
(1)若
是
的一个内角,且
,求
的值;
(2)已知
,
,
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f5a43b39c775f6431184a887541ec52.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c6b0087c0efa96dc4097f07ad0f748b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cefeebfdf2f30fe359867e3d545a565e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76acd78dd383b522faa6e69fae1aab2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36f2f86d10cd02fc63752855aa0e5084.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f0399c78088b4c6fc231a0a5c7a9918.png)
您最近一年使用:0次
2023-01-14更新
|
940次组卷
|
3卷引用:河南省信阳高级中学2023-2024学年高一下学期开学考前测试数学试题
河南省信阳高级中学2023-2024学年高一下学期开学考前测试数学试题重庆市第一中学校2022-2023学年高一上学期期末数学试题(已下线)专题7 大题分类练(向量的数量积与三角恒等变换)(拔高能力练)(人教B)
2 . 已知
是方程
的两根,求下列各式的值:
(1)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fee7e2969987222954a10a03d200c03.png)
(2)
;
(3)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dab0e25cb7c556f914e6bc15727ae556.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1467984bfc64fb33e90618126747312b.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fee7e2969987222954a10a03d200c03.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4562e8db9a737d773608fe4c37112569.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88c0bee996d63ad7afcd06987d175983.png)
您最近一年使用:0次
2022-08-05更新
|
357次组卷
|
2卷引用:河南省荥阳市京城高中2022-2023学年高三上学期开学考试数学试题
名校
解题方法
3 . 已知
.
(1)求
;
(2)若
,且
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9fbf538ae87b660c3a3424729b55d61.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55e187849eb698240cf551b0a6c6196c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e8a1959750cecb177f7c109f11d1a10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7edaaaa6f952f18e480ac22c36563ee0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eacde1c42151734fdc60f3001b590de.png)
您最近一年使用:0次
2022-02-15更新
|
540次组卷
|
4卷引用:河南省林州市第一中学2021-2022学年高一下学期开学检测数学试题
名校
解题方法
4 . 降噪耳机主要有主动降噪耳机和被动降噪耳机两种.其中主动降噪耳机的工作原理是:先通过微型麦克风采集周围的噪声,然后降噪芯片生成与噪声振幅相同、相位相反的反向声波来抵消噪声(如图所示).已知某噪声的声波曲线是
,其中的振幅为2,且经过点
.
![](https://img.xkw.com/dksih/QBM/2022/1/14/2894540192112640/2897000521826304/STEM/ca3c6b85-f132-4ec6-a849-d0ce7567f4d1.png?resizew=209)
(1)求该噪声声波曲线的解析式
以及降噪芯片生成的降噪声波曲线的解析式
;
(2)将函数
图象上各点的横坐标变为原来的
倍,纵坐标不变得到函数
的图象.若锐角
满足
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef63253c42b81fa676ddf78b47902783.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48befa5d90fafd8bfdb6c90fd241ebfb.png)
![](https://img.xkw.com/dksih/QBM/2022/1/14/2894540192112640/2897000521826304/STEM/ca3c6b85-f132-4ec6-a849-d0ce7567f4d1.png?resizew=209)
(1)求该噪声声波曲线的解析式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
(2)将函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d88591679796c52024d11c4de641bdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a813b5adbf5c7082561237894ba6d599.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6411a0efd11c521a7bf7306ddf0a148c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67dbce6d654dd35a89cdc914c545d366.png)
您最近一年使用:0次
2022-01-18更新
|
243次组卷
|
2卷引用:河南省林州市第一中学2021-2022学年高一下学期开学检测数学试题
名校
解题方法
5 . 在
中,角
、
、
的对边分别为
、
、
,
,
.
(1)求
;
(2)若边
上中线
,求
的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/f7f85678de64dcc06b3efcdb6a127170.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/002a39ecdc9dd25d9c790e1aac277481.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6402f1010e94be78552ed4c45548b1b8.png)
(2)若边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d37a75237da250420c446ee31cb43265.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次
名校
6 . 已知
,设向量
,
.
(1)若
,求x的值;
(2)若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c21376567e7a56b85e967dc4f2a5cef3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84fbaecb24ba471e722d775c009ba9cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38c84484038bfeb61eb577508b6a6e3d.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/242b0af4f33851007b2052508dd3790e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bb9747f21e7e3dbcecf57f172f768ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56b711080bb0ffe80c6c54eb11f49f01.png)
您最近一年使用:0次
2020-09-15更新
|
274次组卷
|
8卷引用:河南省信阳高级中学2023-2024学年高二上学期开学考试数学试题
名校
解题方法
7 . 在平面直角坐标系
中,点
,点
在单位圆上,
(
).
(1)若点
,求
的值;
(2)若
,
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d295a4cc3a58f9f38ee98337313c81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb7e00f8bacce4d649b535449f04568c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0917d846965359153058d56498f076bb.png)
(1)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f66be1f73f0a04c07365fb01b64058b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa12fb14cd345928660152903ed9df21.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db6062db6b538f51fd3e5e3b4c563ec4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4521d23bdf64ceed8e9f26db538ce77e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99f69cbee579cfa9f4770241dd4b5fb6.png)
您最近一年使用:0次
2017-08-22更新
|
686次组卷
|
2卷引用:河南省实验中学2023-2024学年高二上学期开学考试数学试题