题目
题型:不详难度:来源:
已知
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020005829-30496.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020005829-42842.png)
(1)当
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020005829-17354.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020005829-75725.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020005830-25462.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020005830-59065.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020005830-25462.png)
(2) 设AP=x,AQ=y,然后再利用余弦定理可用x,y表示PQ即
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020005830-31770.png)
因为
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020005830-78612.png)
(1)由余弦定理得
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020005830-59065.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020005830-25462.png)
(2)设AP=x,AQ=y,则
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020005830-31770.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020005831-42147.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020005831-65718.png)
当且仅当x=y时,即AP=BP=2时,PQ取到最小值,最小值是2. ………12分
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020005825-21638.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020005825-49152.png)
A.![]() | B.![]() | C.![]() | D.![]() |
在锐角
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020005816-43156.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020005816-82228.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020005816-64102.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020005816-30173.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020005817-49818.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020005817-73448.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020005817-62768.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020005817-26701.png)
(Ⅰ)求角
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020005817-73448.png)
(Ⅱ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020005817-25979.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020005817-17597.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020005816-43156.png)
已知向量
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020005806-40213.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020005806-91414.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020005806-92708.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020005806-79959.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020005806-59556.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020005806-61839.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020005806-90398.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020005806-80799.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020005806-31637.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020005807-20466.png)
(1)求角C的大小;
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020005807-81821.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020005807-90593.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020005807-55276.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020005807-34535.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020005807-20466.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020005801-95878.png)
A.锐角三角形
B.直角三角形
C.等腰三角形
D.钝角三角形
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020005751-74951.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020005751-14080.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020005751-92944.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020005752-12987.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020005752-87053.png)
(2)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020005751-74951.png)
最新试题
- 1阅读理解。Dear friend, I am an American girl. My name is Sara
- 2分类是学习和研究化学物质及其变化的一种常用的基本方法。家庭常用的调味品、人的正常生理活动所必不可少的氯化钠,它与下列哪组
- 3若则的值为 ( ) A.B.C.D
- 4下列关于违法行为的说法,正确的一项是 [ ]A.违法行为包括一般违法行为和犯罪行为 B.应被逮捕判刑的行为才是违
- 5下图为在高温高压、催化剂条件下氮气和氢气发生化合反应的微观模拟图:其中、 分别表示氮原子和氢原子。请回答下列问题。(1)
- 6下列物质可以看做是纯净物的是 ( )A.河水B.海水C.蒸馏水D.农夫山泉矿泉水
- 7读“等高线地形图”,回答1—2题。1、图示地区的地形特点,描述正确的是[ ]A、地形以山地为主,地势西北高东南低
- 8因夫妻关系长期不和,丈夫经常为家庭琐事殴打妻子,在忍无可忍的情况下,妻子手持钢条将丈夫打死。2010年8月7日,54岁的
- 9The number of the travellers visiting the city _______ than
- 10.Not all the students sitting in the back row can see the wo
热门考点
- 1函数图象上两点(其中)的直线的斜率为 。
- 2阅读下面的材料,根据要求写一篇不少于800字的文章。法国人帕斯卡有句传世名言:“人是一根脆弱却有思想的苇草。”一个人不思
- 3向高为H的水瓶中注水,注满为止,如果注水量V与水深H的函数关系的图象如上图所示,那么水瓶的形状是( )A.B.C.D.
- 4阅读理解 In Britain all children have to go to school betwee
- 5北魏初,给事中李安世上言:“岁饥民流,田业多为豪右所占夺;虽桑井难复,宜更均量,使力业相称。又,所争之田,宜限年断,事久
- 6在△ABC中,角所A,B,C对的边分别为a,b,c,且满足,(1)求△ABC的面积;(2)若c=1,求a的值。
- 7如图AC⊥BC,BD⊥AD,AC=BD,则图中全等三角形的对数为( )对.A.0B.1C.2D.3
- 8清初诗人屈大均有诗:“洋船争出是官商。十字门开向二洋。五丝八丝广缎好,银钱堆满十三行。”这首诗说明清初①官府垄断对外贸易
- 9下列各句中加点的成语,使用恰当的一项是(3分)( ) A.义门是陈村最古老的建筑,与义门形影相吊的是它的左侧立着的一
- 10(26分)阅读材料,完成下列要求。十六大以来,党和国家高度重视文化体制改革,推动社会主义文化大发展大繁荣。材料一 2