题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070331-26999.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070331-58291.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070331-86531.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070332-46205.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070332-46880.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070332-50430.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070332-14220.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070333-54023.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070331-58291.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070331-86531.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070333-27345.gif)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070333-21878.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070334-81601.gif)
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070331-58291.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070334-59302.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070334-40625.gif)
答案
解: (1)由已知得
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070334-23611.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070335-91476.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070335-79430.gif)
则
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070335-29172.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070335-64720.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070336-30239.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070336-89392.gif)
(2)由
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070334-59302.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070336-81134.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070337-40858.gif)
由于
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070337-85706.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070337-20499.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070338-35451.gif)
当且仅当
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070338-45063.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070338-51603.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070334-40625.gif)
解析
核心考点
试题【已知函数的图像与、轴分别相交于、,(、分别是与、轴正半轴同方向的单位向量),函数.(1)求、的值;(2)当满足时,求函数的最小值.】;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/20191104/20191104070327-36812.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070328-45301.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070328-76423.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070328-46627.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070328-98146.gif)
A 30° B 60° C 120° D 150°
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070324-67763.gif)
A 外心
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070325-26962.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070321-42191.gif)
A 30° B 60
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070321-24546.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070315-92369.gif)
A 5 B -5 C
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070315-14986.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070315-67827.gif)
8.已知M、N是△ABC的边BC、CA上的点,且
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070309-16881.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070309-88182.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070309-53878.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070310-23670.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070309-88182.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070310-10510.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070310-64207.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070310-22309.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070311-68040.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070311-51861.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104070311-80277.gif)
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