已知函数
,
,
恒成立,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad4ddd782af8d1b8e3217a302e14c411.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5832df51f7e9f83bdd534788ec773bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ad5fe274cfc8da2dacfb65801f344ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8b023b37c30e3ff41eb00d70c463497.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad4ddd782af8d1b8e3217a302e14c411.png)
更新时间:2023-04-26 21:07:19
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适中
(0.65)
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【推荐1】下列说法正确的个数是___________ .
①在
中,
是
的充分不必要条件
②若函数
为幂函数,且在
单调递减,则实数
.
③已知
,则
;
④定义
,已知
,则
最大值为
①在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ff214d99784c6b23b7784bdaf3ed37a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/716608243ca50e47b20b67fc518e52a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69ff7f020f97a8d07fecb8c56042fd38.png)
②若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29ce95b7742b02299845325566151c96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93f1b4e037116928fd60f5892a211819.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dedff09ac873e40c3ee0ce3ecf2fa032.png)
③已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c390068a9860f3d2b47543cad16d31c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f78d959ff72a12ead6ab9cc85ac3a004.png)
④定义
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4055a6841d53fc3282f23be6bbb9148d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b48ee84f7af61e252d90e3c0b124fc5.png)
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【推荐2】已知
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c73626441d3b0602b49e5d90f845435.png)
_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7462bd5fd934229b49acb8ddad4845a3.png)
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【推荐1】若复数
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【推荐2】已知函数
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