题目
题型:难度:来源:
【题文】(本小题满分8分)
已知全集
,![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322134426-77033.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322134427-62227.png)
(1)求
;
(2)若
,求实数
的取值范围.
已知全集
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322134426-72996.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322134426-77033.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322134427-62227.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322134427-34869.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322134427-93641.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322134428-82532.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322134428-42047.png)
答案
【答案】(1)
,
或
;(2)![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322134430-79887.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322134429-93985.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322134429-95320.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322134429-53615.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322134430-79887.png)
解析
【解析】
试题分析:(1)由已知解得
,通过集合的运算可得解;(2)由
可知
,由此建立关于实数a的关系式,易求出实数a的范围.
试题解析:(1)
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322134431-19029.png)
(2)![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322134432-65543.png)
,![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322134432-78289.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322134433-11676.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322134432-78289.png)
,
考点:集合的关系与运算
试题分析:(1)由已知解得
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322134430-91850.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322134430-22785.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322134430-53065.png)
试题解析:(1)
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322134431-79125.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322134431-40450.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322134431-19029.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322134432-65543.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322134428-82532.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322134432-78289.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322134433-11676.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322134432-78289.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322134433-17215.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322134432-78289.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322134433-62188.png)
考点:集合的关系与运算
核心考点
举一反三
【题文】已知集合A={1,2,3},B={(x,y)|x∈A,y∈A,x+y∈A},则B中所含元素的个数为( )
A.2 | B.3 | C.4 | D.6 |
最新试题
- 1在△ABC中,(1)若a=4,B=30°,C=105°,则b=________.(2)若b=3,c=,C=45°,则a=
- 2-What did your parents think about your decision? -They alwa
- 3The scarf her T-shirt.A. match B. looks great
- 4若,是平面内的一组基底,则下列四组向量不能作为平面向量的基底的是( )A.+和-B.3-2和-6+4C.+2和2+D
- 5右图建筑物为平顶,造成这种特点的主要原因是A.风力大B.气温高C.日照强D.降水少
- 6下列事例能够体现“生命是有价值”的是[ ]①为了迅速致富,王勇倒卖黑心棉被②王兰资助西部失学儿童继续念书③王军自
- 7函数y=xlnx的单调减区间为 ______.
- 8下列有关图像的分析正确的是
- 9It rained continuously for about 3 hours on the way, complet
- 10人民日报发表评论员文章指出:我们党作为马克思主义政党,历来把理论创新看做永葆自己生机活力的根本,而理论创新是在不断推进马
热门考点
- 1从左面看如图所示的几何体可得到的平面图形是( )A.B.C.D.
- 2 _______, a learned man makes fewer mistakes in life than a
- 3由于“核泄漏污染盐厂”的谣言,河北省部分地区的商场、超市食盐脱销,不法经营者也开始囤积食盐、哄抬盐价。2011年3月17
- 4下列溶液中溶质的物质的量浓度为1mol•L-1的是( )A.将40gNaOH溶解于1L水中配成的NaOH溶液B.常温常
- 5给定集合A、B,定义A*B={x|x=m-n,m∈A,n∈B},若A={4,5,6},B={2,3},则集合A*B中所有
- 6一直流传至今的年画、剪纸画、木刻版画反映了我国浓郁的民间风情特色,这些风俗画盛行于 [ ]A.唐代 B.两宋 C
- 7【题文】函数,则_______________.
- 8设NA为阿伏伽德罗常数,下列叙述正确的是( )A.28gC2H4所含共用电子对数目为4NAB.1L0.1mo
- 9家风也指门风,是一家或一族世代相传的道德准则和处世方法,有什么样的家风往往就有什么样的做人做事的态度和为人处世伦理,甚至
- 10某温度时,Ag2SO4在水溶液中的沉淀溶解平衡曲线如图所示:(1)a点表示Ag2SO4______ (填“饱和”或“不饱