题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115642-59442.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115642-17447.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115643-65265.png)
(2)在锐角三角形
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115643-64827.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115643-91316.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115643-34622.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115644-38529.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115644-63149.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115644-78623.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115644-55373.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115645-28664.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115645-66533.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115645-30347.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115645-76793.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115643-91316.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115645-75465.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115646-70342.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115646-12952.png)
解析
试题分析:(1)由函数
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115642-59442.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115642-17447.png)
(2)由(1)及
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115645-28664.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115646-39831.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115646-15296.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115643-91316.png)
(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115647-23815.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115647-93768.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115646-70342.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115647-43326.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115646-70342.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115643-65265.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115645-75465.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115646-70342.png)
(2)∵
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115647-85046.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115647-35889.png)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115648-64683.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115648-10362.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115648-85699.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115648-10592.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115646-39831.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115648-68842.png)
由余弦定理得
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115649-78666.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115646-12952.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115628-95312.png)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115628-25597.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115628-57528.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115629-50421.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115628-25597.png)
(2)求
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115628-25597.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115629-72701.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115617-38603.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115618-16870.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115504-22024.png)
(1)当
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115505-67408.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115505-26708.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115505-82703.png)
(2)设函数
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115505-81548.png)
(ⅰ)若函数
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115505-35465.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115506-85692.png)
(ⅱ)在(ⅰ)的条件下,若
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115506-48961.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115506-37531.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115506-16191.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115347-87145.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115347-53560.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115347-43771.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115347-68468.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115320-65391.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115320-18697.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115320-62031.png)
(1)求证:函数
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115320-91927.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115321-43291.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115320-91927.png)
(2)若函数
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115320-91927.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115321-10107.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017115321-32418.png)
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