已知a,b为实数,集合M={b,1},N={a,0},f:x→x为集合M到集合N的映射,则a+b等于( )
A.﹣1 | B.2 | C.1 | D.1或2 |
更新时间:2020-01-10 18:32:55
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【推荐1】在映射
中,
,且
,则元素
在
作用下的原像是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a662f934b3bf3ad6f1f1414fedb381d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24bc4ea99df733f275564b9d65683f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69936eddaa8ea14a8433be89186ff89f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/631386549c0cec5981a1da47b05e5d25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca4ff0af96ea467337cb30c4c765b5f7.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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单选题
|
容易
(0.94)
【推荐2】设映射
、
都是由数集
到
的映射,其对应法则如下表(从上到下):
则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca4ff0af96ea467337cb30c4c765b5f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/276509f01529d982ab21e479a4619268.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
映射![]() | ||||
![]() | 0 | 1 | 2 | 3 |
![]() | 2 | 3 | 4 | 1 |
映射![]() | ||||
![]() | 0 | 1 | 2 | 3 |
![]() | 3 | 4 | 1 | 2 |
则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efcde0b88a6c0a20fcad3f9a43c6fe74.png)
A.1 | B.2 | C.3 | D.4 |
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