题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911042325-44908.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911042325-24514.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911042325-85956.png)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911042325-93483.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911042325-12171.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911042326-80041.png)
(2)在△ABC中,角A,B,C的对边分别是
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911042326-24334.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911042326-59371.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911042326-11088.png)
由
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911042325-93483.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911042327-83790.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911042327-88880.png)
从而可得
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911042327-21551.png)
则
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911042327-61688.png)
(2)由
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911042326-59371.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911042328-35986.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911042328-74347.png)
故f(B)=sin(
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911042328-29702.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911042328-40775.png)
解析
核心考点
试题【已知向量,设函数+(1)若,f(x)=,求的值;(2)在△ABC中,角A,B,C的对边分别是,且满足,求f(B)的取值范围.】;主要考察你对正弦函数的图象与性质等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911042317-70196.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911042317-33538.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911042309-52374.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911042309-36723.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911042309-30263.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911041922-33305.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911041922-51215.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911041922-61946.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911041922-12760.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911041808-99884.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911041808-36644.png)
A.先向左平移![]() ![]() |
B.先向左平移![]() |
C.先向左平移![]() ![]() |
D.先向右平移![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911041756-74273.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911041756-70452.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911041756-88848.png)
(1)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911041757-37465.png)
(2)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911041757-37465.png)
最新试题
- 1如图,小磁针处于静止状态(黑色部分为N极),由此可以判定A,B两个磁极的极性是[ ]A.A为S极,B为N极B.A
- 2—He’s got our tickets.—That’s good I ________afraid that he
- 3You won’t feel happy at school ______ you get on well with y
- 4下列语句中错误的是 [ ]A.数字0也是单项式B.单项式﹣a的系数与次数都是1 C.xy是二次单项式D.﹣的系数
- 5That evening, ___ I will tell you more about later, I ended
- 6-3的绝对值是( )A.3B.-3C.-13D.13
- 7_________年4月,_______和日本首相_________在日本______签订了中日《________ 》,
- 8今年6月,我国又有一大批优秀大学毕业生通过选拔到全国各地的农村基层担任“村官”,对大学生到农村基层任职的做法,你认为下列
- 9What did young people in like to wear? [
- 10在直角坐标系中,已知△ABC的顶点坐标为A(0,0),B(-1,2),C(0,3).求△ABC在矩阵0-110作用下变换
热门考点
- 1已知等差数列{an}的前n项和为Sn,a5=5,S5=15,则数列的前200项和为 ( ).A.B.C.D.
- 2(12分)实验室配制500mL 0.1mol/L的NaOH溶液,有如下操作步骤:①计算所需NaOH固体的质量并用托盘天平
- 3某公司今年初用25万元引进一种新的设备,设备投入运行后,每年销售收入为21万元.已知该公司第n年需要付出设备的维修和工人
- 4Li Ming made great progress ________ of his parents.[ ]A
- 5赤潮是某些浮游生物爆发性繁殖引起水色异常和水质恶化的现象。赤潮的出现和人类活动排放的污染物有关。据此完成题。小题1:引发
- 6我国下列资源中居世界第六位的是[ ]A.领土面积 B.耕地面积 C.森林总面积 D.矿产资源储量总值
- 7已知点M(a,b)在直线3x+4y=15上,则a2+b2的最小值为______.
- 8【题文】设函数在区间上是减函数,则实数的取值范围是___________.
- 9一个饲养场中,鸡与猪的头数和为90头,鸡与猪的腿数和为320只,设鸡为x只,猪为y只,则列方程组为( )A.x+y=3
- 10下图的植物应该属于____植物。在阳光下,有4种物质进出叶片。其中人类生命活动不需要的是____,能储存在果实里并能提供