1 . 已知
,若集合
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0149a694bc310911f0e371ebbbf71488.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7270af750eeaeb83f47d91114147020b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bf6432540acf70be76f83c933aae60d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0149a694bc310911f0e371ebbbf71488.png)
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2 . 集合
,若
,则实数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb9ec78f0bc169af6688aad5d8dfbad8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7d5735f001126b17c15b65174076ba3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
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2011·四川成都·一模
名校
3 . a、b为实数,集合
表示把集合M中的元素x映射到集合N中仍为x,则![](https://img.xkw.com/dksih/QBM/2010/8/23/1569819628273664/1569819633262592/STEM/7936f2800a3546148d8fe1c4d9a61311.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/672cb8c3772969686040b857c826c907.png)
![](https://img.xkw.com/dksih/QBM/2010/8/23/1569819628273664/1569819633262592/STEM/7936f2800a3546148d8fe1c4d9a61311.png)
A.1 | B.0 | C.-1 | D.±1 |
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