已知集合
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/288e39a1bd965f85bccbdbfc60473ff7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da37365796872a67a344bfbedb9d046a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57365c91d329db1ca1eba99e2fc13548.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
更新时间:2020-02-19 05:40:07
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容易
(0.94)
【推荐2】若A、B、C为三个集合,
,则一定有 ( )
![](https://img.xkw.com/dksih/QBM/2011/11/11/1570348706275328/1570348711370752/STEM/017a3bac79774efbbda5a2690e565a66.png?resizew=91)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
|
容易
(0.94)
【推荐1】现定义运算“★”:对于任意实数
、
,都有
,如
,若
,则实数
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eddc53a4be529d1dab111d24f285d83a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2970388ed2ca1057da9ec844ebae0993.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf8f332dfc624774341524781c07fc37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
A.3或![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
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容易
(0.94)
【推荐2】实数a,b在数轴上的对应点的位置如图所示,下列结论中正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/3/762a1f6f-195d-4977-8b31-3ac3ff61ea1b.png?resizew=203)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次