题目
题型:解答题难度:一般来源:不详
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822180808-35391.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822180808-18133.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822180808-17378.gif)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822180809-71705.gif)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822180809-30107.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822180809-10153.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822180809-87087.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822180809-33557.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822180810-46967.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822180810-87478.gif)
由正弦定理,得
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822180810-91304.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822180811-93894.gif)
又
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822180811-44500.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822180811-42380.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822180811-74938.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822180809-71705.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822180811-45600.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822180814-81445.gif)
因此
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822180809-71705.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822180814-35619.gif)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822180809-30107.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822180814-10904.gif)
由正弦定理得
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822180815-18663.gif)
设
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822180815-91076.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822180815-47613.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822180814-35619.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822180815-39686.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822180815-68513.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822180816-29463.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822180809-10153.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822180809-33557.gif)
核心考点
试题【(本小题满分12分)在△ABC中角A、B、C的对边分别为设向量(1)求的取值范围;(2)若试确定实数的取值范围.】;主要考察你对任意角三角函数的概念等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822180740-51942.gif)
A.1 | B.![]() | C.![]() | D.2 |
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822180713-48794.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822180621-17188.gif)
在
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822180603-76250.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822180603-81846.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822180603-91838.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822180604-23200.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822180604-99060.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822180604-29101.gif)
A.- ![]() | B.![]() ![]() | C. -1 | D.1 |
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822180511-30871.gif)
在数1和100之间插入
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822180512-58917.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822180513-33127.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822180513-33127.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822180513-89740.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822180513-13101.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822180513-78952.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822180514-63654.gif)
(Ⅰ)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822180515-77479.gif)
(Ⅱ)设
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822180516-23633.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822180516-52472.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822180512-58917.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822180516-52494.gif)
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