1 . 设a,
,则“
”是“
且
”的必要不充分条件.( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b40bbcaa8b5200d9126aedd76d02e721.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7700c3577cd8febdf136ca5984c4ea81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/030a328f9a72e0a59f5a48a3cb4e7289.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31b89b579e5a5aff297e30bd5682bf00.png)
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2 . “
”是“
”的必要不充分条件. ( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46c97e1082c4cead21fdbf6fdda10c0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39cc033406da2cdd342308972c6701f1.png)
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3 . 设集合
,
,则“
”是“
”的必要不充分条件. ( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/043f3f5b5238b377373c4ab58be2fec6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe123448fb2e5be04204cd98f64097e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ed006b944ea64f970fee46e2f558467.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e23af61cd402b3789af2401bde9cbefe.png)
您最近一年使用:0次