名校
1 . 函数
的定义域为
,若存在一次函数
,使得对于任意的
,都有
恒成立,则称函数
在
上的弱渐进函数.下列结论正确的是______ .(写出所有正确命题的序号)
①
是
在
上的弱渐进函数;
②
是
在
上的弱渐进函数;
③
是
在
上的弱渐进函数;
④
是
在
上的弱渐进函数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a26b255a8741a6ea41b372b184c560e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8893cfe1ac6b67bdb12cbd3e540186c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ae63d882de903494cb145bfed14fcb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc69dd6b191f31ea8d87f867a456a4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a26b255a8741a6ea41b372b184c560e5.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4306fb6d5419322b4b7b9140e06e43a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/458cbf06122152fe8d62550c6873faa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52a117e2654de2baf925540cca08cbec.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7629b32068eceefee92962b82645b6b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b639ac9599358d08bd6e1c389ceb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52a117e2654de2baf925540cca08cbec.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e4538f7b6692d02fc3c2909b488632c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c7ed99a74e126a05cb520f19c094020.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52a117e2654de2baf925540cca08cbec.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffa1c68cebf2203d277f61cfdbacf175.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a05ebb52ecf575c36d66163955c8f26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52a117e2654de2baf925540cca08cbec.png)
您最近一年使用:0次
解题方法
2 . 已知函数
,函数
在区间
上零点的个数是________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f00a5f254198395a5f19fb60d3ff5a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6a1de6a6837feee143a49a30903fe24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e01bdb397022416fb96f87e4738a97f8.png)
您最近一年使用:0次