题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011614-57438.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011614-52512.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011615-92624.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011615-80500.png)
(1)是否存在实数
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011615-48788.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011615-48713.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011615-48788.png)
(2)求使
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011615-71935.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011615-76955.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011615-33169.png)
解析
试题分析:解题思路:(1)用
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011615-48788.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011616-77551.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011616-91144.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011615-48788.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011616-91594.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011615-48788.png)
试题解析:(1)设
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011616-24863.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011616-78354.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011616-24355.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011616-88482.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011617-51140.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011617-96623.png)
即
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011617-10243.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011615-76955.png)
由(1)得,
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011617-87533.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011617-53727.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011618-72586.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011615-33169.png)
核心考点
试题【设=(5,1),=(1,7),=(4,2),且.(1)是否存在实数 ,使?若存在,求出实数;若不存在,请说明理由;(2)求使取最小值点M的坐标.】;主要考察你对平面向量应用举例等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011605-56826.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011605-74680.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011605-42168.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011549-25237.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011549-86307.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011550-42894.png)
(2)如图,平行四边形
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011550-77886.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011552-65847.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011552-52014.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011552-92826.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011553-87608.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011553-17875.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011553-15127.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011553-63721.png)
试以
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011553-17875.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011553-63721.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011554-38345.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011554-27007.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011554-51341.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011554-60436.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011544-89061.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011545-98451.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011545-84047.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011545-52731.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011545-98451.png)
A.![]() | B.![]() | C.1 | D.2 |
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011537-31675.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011538-72745.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011538-81793.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011538-67079.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011538-62839.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011539-14020.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011539-48802.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011530-85124.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011530-62058.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011530-53538.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105011530-92366.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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