题目
题型:单选题难度:简单来源:不详
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000846-21014.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000847-74803.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000847-43050.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000847-63300.png)
A.![]() | B.1 | C.![]() | D.0 |
答案
解析
试题分析:由题意得
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000848-58899.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000848-98898.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000848-34854.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000848-85592.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000848-64458.png)
核心考点
举一反三
a∧b=
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000845-30184.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000845-90471.png)
若正数a、b、c、d满足ab≥4,c+d≤4,则( )
A.a∧b≥2,c∧d≤2 | B.a∧b≥2,c∨d≥2 | C.a∨b≥2,c∧d≤2 | D.a∨b≥2,c∨d≥2 |
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000839-35801.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000839-16888.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000840-94826.png)
(ⅰ)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000840-85100.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000840-57795.png)
(ⅱ)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000840-62083.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000840-87552.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000841-43435.png)
(ⅲ)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000840-87552.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000841-24048.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000841-16619.png)
(ⅳ)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000841-59639.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000841-50840.png)
则称集合
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000840-94826.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000842-26487.png)
下面给出三个集合及相应的运算“
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000842-26487.png)
①
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000842-32658.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000842-26487.png)
②
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000842-50341.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000842-26487.png)
③
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000842-13146.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000842-26487.png)
其中可以构成“对称集”的有 .(把所有正确的序号都填上)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000836-44899.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000836-86891.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000836-68455.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000836-65468.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000836-32772.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000836-77192.png)
A.1个 | B.2个 | C.3个 | D.4个 |
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000831-41376.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000832-99234.png)
A.{1,2} | B.{2,4} | C.{1,2,3,4} | D.{1,2,3} |
最新试题
- 1大前提:资本主义经济危机是由于生产社会化同生产资料私人占有这一基本矛盾产生的。小前提:罗斯福新政将美国私人垄断推向国家垄
- 2Large quantities of oil in a place near my hometown rec
- 3正常转动的钟表面上,3点半时,时针与分针的夹角是______度.
- 4已知,a=﹣+1(1)求a、c的值;(2)若一元二次方程ax2+bx+c=0有一个根是1,求b的值和方程的另一个根.
- 5如图,是计算输入转换程序图,开始输入x的值为5,发现第一次得12,第二次得6;若输入10,第三次得到( )。
- 6英国资产阶级革命爆发前,反对国王专制统治的阵地在 [ ]A. 议会 B. 三级会议
- 7下列性状中,属于相对性状的是[ ]A.狗的黄毛和鹅的白毛 B.狗的黑毛和黄毛 C.狗的卷毛和黄毛 D.蛇的爬行和
- 8小明在做数学题时,发现下面有趣的结果:3﹣2=18+7﹣6﹣5=415+14+13﹣12﹣11﹣10=924+23+22
- 9如图,将一副直角三角尺的直角顶点重合成如图状,若∠AOD=125°,求∠OED的度数。
- 10在如图所示的闭合电路中,移动滑动变阻器的滑片,电压表读数在逐渐增加,则电流表读数( )A.增大B.减小C.先减小后增大
热门考点
- 1已知与之间的部分对应关系如下表:1112131415……则和可能满足的一个关系式是
- 2第二节完形填空(共20小题;每小题1分,满分20分)阅读下面短文,掌握其大意,然后从第21—40各题所给的四个选项(A、
- 3都江堰是我国古代闻名世界的防洪灌溉工程,它是战国时期哪一国修建的[ ]A.齐国B.楚国C.赵国D.秦国
- 4The children are still upstairs. Go and get them to come ___
- 5设F1、F2是双曲线的两个焦点,点P在双曲线上,且的值为 ( )A.2
- 6抗震救灾中,假设某次在无风无雨的理想情况下,直升机悬停在空中向地面投放装有救灾物质的箱子,如图所示.设投放时箱子的初速度
- 7为探究NH3的溶解性,某兴趣小组按如图所示装置进行实验(f为止水夹),请回答下列问题: (1)写出实验室制取氨气的化学方
- 8(2分)氧气是化学性质比较活泼的气体,可以与许多物质发生反应。氧气的这一特性,使氧气在生产和生活中有着广泛的应用;也正是
- 9先化简,再在数轴上表示下列各数,并用“<”号连接.-(-3),0,-12,-|-3.5|,-(+212)
- 10一 Why did Miss Wang look so worried when I saw her?- Because