题目
题型:单选题难度:简单来源:不详
A.Φ | B.![]() | C.![]() | D.![]() |
答案
解析
∵A∩B=A
∴A⊆B
A∩B=A
∴A=∅;A={3}; A={4}
当A=∅时,a=0
当A={3}时有3a﹣1=0解得a=
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817080230-48510.png)
当A={4}由4a﹣1=0解得a=
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817080230-92478.png)
a的所有可能值组成的集合是{0,
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817080230-31723.png)
故选D
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817080224-22874.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817080224-79595.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817080224-19457.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817080224-69435.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817080224-48487.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817080225-57059.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817080225-81323.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817080225-88471.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817080225-81582.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817080220-92675.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817080220-43067.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817080220-65985.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817080216-58296.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817080216-14033.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817080217-71274.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817080213-22444.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817080214-63032.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817080214-81481.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817080208-93172.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817080208-61276.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817080208-34922.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817080208-68573.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817080209-69751.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817080209-38213.png)
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