设
,则“
”是“
”的_________ 条件.(在一下条件中填一个:充分不必要,充要,必要不充分,既不充分又不必要)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ae470980d6e3b53c65b9d42d1f011c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca109c726ca26d44d0142611757cb0c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2ff0fcbb9f3fb47e8e7e484e7b32ab5.png)
更新时间:2020-09-01 19:26:30
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