名校
1 . “
”是“
”的______ 条件.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4922b8d207b94816e08e8fd929dde3f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c3238e3c90f2f6ae114791e38c9f6c8.png)
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名校
2 . 设
,若
,则
的取值范围为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5ab4b75fa22deba7fcbcdcb31dd45b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/271908eb10459506cbaa3e054ad39be4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0724083220fed03c97336756d5cdc58.png)
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