题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102125-30839.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102126-18123.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102126-64454.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102126-47571.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102126-78466.png)
是( )
A.1或![]() | B.1或![]() | C.1或![]() | D.1或![]() |
答案
解析
分析:由题设条件可知,a2b2=1,
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102126-64454.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102126-47571.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102126-78466.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102127-71073.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102126-78466.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102127-71073.png)
解:由题意知a2b2=1,
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102126-64454.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102126-47571.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102127-94255.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102128-68413.png)
∴a2+b2=4-2ab,a+b=2ab,∴
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102126-78466.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102127-71073.png)
由a2b2=1知ab=±1.
当ab=1时,
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102126-78466.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102127-71073.png)
=
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102128-28535.png)
=1.
当ab=-1时,
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102126-78466.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102127-71073.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102128-73958.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102128-24348.png)
故
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102126-78466.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102128-24348.png)
答案:D.
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102119-40142.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102119-78941.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102120-16399.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102120-33303.png)
A.(![]() | B.[![]() | C.(![]() | D.[![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102108-24314.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102108-24314.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102108-64737.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102108-58959.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102103-38964.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102103-68077.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102103-81370.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102103-50201.png)
A.![]() | B.![]() | C.0 | D.1 |
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102041-77023.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102041-85644.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102041-57951.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102041-66742.gif)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102042-72124.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102042-26128.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102042-59084.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102041-77023.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102042-59469.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102025-33757.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102025-61395.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102026-25339.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102026-37286.gif)
(1)求公比
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102025-61395.gif)
(2)令
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102027-75511.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102027-10056.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102027-60896.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014102027-66101.gif)
最新试题
- 1以下属于神经系统结构和功能基本单位的是[ ]A.神经 B.脑和脊髓 C.神经元 D.脑干
- 2水和无机盐不是营养物质。 [ ]
- 3现有下列4种物质:①NH3、②SO2、③NaCl溶液、④H2SO4溶液.其中,能使品红溶液褪色的是______(填序号,
- 4一五计划期间,中国第一个生产载重汽车的工厂在哪里建成投产A.长春B.武汉C.沈阳D.北京
- 5如图是某厂生产的某种加钙食盐包装标签上的部分文字,请阅读后回答以下问题:(1)为了检验此盐中是否含有碘酸钾,可用KI-淀
- 6中秋节时,一些食品商和星级酒店推出了售价高昂月饼、月饼礼盒等应节商品,一个月饼标价500元,这500元是 [ ]
- 7下表为往返于北京和上海之间的C13次和V14次特别快车的运行时刻表:车次到、发站时间北京天津西济南上海C13到站时间--
- 8下列与金属腐蚀有关的说法,正确的是A.图1中,插入海水中的铁棒,越靠近底端腐蚀越严重B.图2中,往烧杯中滴加几滴KSCN
- 9实现人生意义,追求生命的价值,正确的做法是( )①干好自己的本职工作 ②要从现在做起 ③从日常点滴
- 10下图为泌尿系统组成示意图,形成尿液的器官是 [ ]A.1 B.2 C.3 D.4
热门考点
- 1用所给动词的适当形式填空。 I 1 (be) a student in Grade Two in
- 2在科学史上,中国有许多重大发明,为世界现代物质文明奠定了基础,以上发明属于化学史上中国对世界的重大贡献的是①造纸 ②印刷
- 3若3y=-2,则y=______.
- 4若直角坐标平面内的两不同点、满足条件:①、都在函数的图像上;②、关于原点对称,则称点对是函数的一对“友好点对”(注:点对
- 5洋务运动***的标志 。
- 6过抛物线X2=2py(p>0)的焦点作斜率为1的直线与该抛物线交与A,B两点,A,B在x轴上的正射影分别为C,D,
- 7已知AB=10cm,在AB的延长线上取一点C,使AC=16cm,则线段AB的中点与AC的中点的距离为[ ]A.5
- 8“安固里淖”,史称鸳鸯泺,是华北第一大高原内陆湖,草原面积23万亩,水域10万亩,曾经水草丰美,鹅雁栖息。短短几年时间,
- 9如图,一个碗摆放在桌面上,则它的俯视图是[ ]A.B.C.D.
- 10(本题满分10分)先化简再求值:,选一个使原代数式有意义的数带入求值.