题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000835-16633.png)
(1)设
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000835-59132.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000835-51083.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000836-70414.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000836-91230.png)
(2).如果
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000836-94135.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000836-94135.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000836-94135.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000836-94135.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000836-14363.png)
(2) 如果
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000836-94135.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000837-64985.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000837-75616.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000836-94135.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000837-45453.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000837-75616.png)
如果
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000836-94135.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000836-94135.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000837-28350.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000837-11940.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000836-94135.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000838-62120.png)
解析
试题分析:(1)显然变量
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000838-67643.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000838-79001.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000838-74905.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000838-74905.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000838-74905.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000836-70414.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000838-74905.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000839-20769.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000837-28350.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000839-17832.png)
(2) 如果
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000836-94135.png)
如果
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000836-94135.png)
(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000838-79001.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000839-74033.png)
即
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000839-86234.png)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000840-42922.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000840-24958.png)
②代入①得
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000840-55409.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000840-59825.png)
由题意知点
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000839-20769.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000837-28350.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000836-94135.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000841-65706.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000839-20769.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000837-28350.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000841-62497.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000839-17832.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000841-54671.png)
(2)如果
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000836-94135.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000841-83286.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000841-44235.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000842-42061.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000842-91166.png)
当且仅当
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000842-50868.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000842-91193.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000837-64985.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000837-75616.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000836-94135.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000843-42250.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000836-94135.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000837-45453.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000837-75616.png)
如果
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000836-94135.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000843-21283.png)
函数在
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000843-82423.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000843-36385.png)
故
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000844-25646.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000844-47409.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000844-12002.png)
即
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000836-94135.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000837-28350.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000837-11940.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000836-94135.png)
核心考点
试题【如图,公园有一块边长为2的等边△ABC的边角地,现修成草坪, 图中DE把草坪分成面积相等的两部分,D在AB上,E在AC上.(1)设(x≥0),,求用表示的函数关】;主要考察你对余弦定理等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000830-24014.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000830-70599.png)
A.![]() | B.![]() | C.2![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000811-23160.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000811-60897.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000812-84003.png)
A.![]() | B.-![]() | C.![]() | D.-![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000759-84761.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020000759-84761.png)
最新试题
- 1中国网民有2.53亿。一方面,网民积极在网上发言;另一方面,越来越多的领导干部上网来交流,这是中国政坛一种新气象。有序的
- 2把氯化氢、生石灰、食盐分别溶于水后,滴入少量紫色石蕊试液、溶液呈现的颜色依次是( )A.红色、蓝色、无色B.红色、蓝色
- 3工业上冶炼金属铝,经常采用的方法是A.电解法B.热分解法C.热还原法D.热氧化法
- 4已知实数x,y满足x2+y2-4x=0,则yx+2的取值范围是( )A.[-33,33]B.(-∞,-33]∪[33,
- 5阅读下面这首诗,回答问题。(6分)新年作[唐]刘长卿乡心新岁切,天畔独潸然。老至居人下,春归在客先。岭猿同旦暮,江柳共风
- 61970年日本大阪世界博览会上的太阳神塔,象征着日本经济的重新崛起。下列与日本经济崛起有关的因素有( )①重视科技与
- 7从椭圆C1:x2a2+y2b2=1(a>b>0)和抛物线C2:x2=2py(p>0)上各取两点.将其坐标记录于表中: x
- 8下列关于物质所属类别的叙述中错误的是A.Al2O3属于两性氧化物B.液氯属于混和物C.Na2SiO3属于强电解质D.纯碱
- 9如果你生活在19世纪70年代的上海,下列场景不可能出现的是[ ]A.穿西服B.吃西餐C.看《申报》D.看电影《定
- 10我国人口最多的少数民族主要分布在( )A.西南地区B.东北地区C.西北地区D.青藏地区
热门考点
- 1根据句意或中英文提示写出所缺单词。1. Water covers about three quarters of the
- 2“关关雎鸠,在河之洲,窈窕淑女,君子好逑”这些反映了当时人们的生活、生产状况,具有朴实的现实主义特色的诗句,出自中国最早
- 3阅读下面语段,按要求回答问题:试想,第一届的“超女”冠军安又琪尚未来得及成为令人追捧的唱片歌星,如今又匆匆推出李宇春、周
- 4After that, he knew he could __ any emergency by doing what
- 5光滑水平地面上静置一辆质量为0.5kg的车,t=0时刻开始,对小车施加一个水平向东的恒力F,F的大小为1N,作用2s后,
- 6为鼓励居民节约用水,某市决定对居民用水收费实行“阶梯价”,即当每月用水量不超过15吨时(包括15吨),采用基本价收费;当
- 76.4 g铜与60 mL浓度为8 mol·L-1的硝酸溶液充分反应,剩余溶液中含H+为n mol,此时溶液中所含NO-3
- 8在2L溶有0.2mol NaCl和0.2mol MgCl2的溶液中,Cl-的物质的量浓度为( )A.0.05 mol/
- 92010年1月1日,中国对外商谈的第一个自贸区,也是发展中国家组成的最大自由贸易区正式启动。它的名称是A.亚洲自由贸易区
- 10下列不属于细胞凋亡现象的是①霜冻导致香蕉植株死亡 ②蝌蚪发育成为青蛙过程中尾部消失 ③寄主细胞因病毒的增殖释放而死亡 ④