题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054116-37178.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054116-39508.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054117-72922.png)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054117-97733.png)
(Ⅱ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054117-42435.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054117-32632.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054118-13588.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054118-73799.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054118-33980.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054119-48764.png)
解析
试题分析:(Ⅰ)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054119-53363.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054119-62403.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054119-99287.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054120-44906.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054120-54109.png)
(法二)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054120-28335.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054116-39508.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054120-60034.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054121-48394.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054121-56811.png)
即
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054121-27643.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054120-54109.png)
(Ⅱ)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054121-51604.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054122-92732.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054122-49537.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054122-52636.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054123-81399.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054123-27471.png)
点评:我们经常通过凑角来应用三角函数公式来解题,常见凑角:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054123-23220.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054124-85907.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054124-82454.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054124-73002.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054124-39978.png)
核心考点
试题【(11分)已知向量,,.(Ⅰ)求的值; (Ⅱ)若,,且,求.】;主要考察你对平面向量数量积的意义等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054108-73993.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054108-63275.png)
且
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054109-79212.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054109-54620.png)
(Ⅰ)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054109-97815.png)
(Ⅱ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054109-94350.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054110-97186.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054110-34366.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054103-39389.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054103-53597.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054103-37111.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054104-39537.png)
A.![]() | B.![]() | C.5 | D.25 |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054054-54787.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054054-80274.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054054-24865.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054044-90119.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054045-48798.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054045-22649.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054045-48798.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054045-22649.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054045-26396.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054045-69873.png)
A.1 | B.![]() | C.2 | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054036-62348.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054037-85861.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054037-30743.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054037-59797.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054038-95290.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054038-32445.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054038-12046.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054038-43872.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054039-68491.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054039-27792.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054037-59797.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054039-78374.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104054039-19636.png)
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