名校
解题方法
1 . 已知下列四个说法中:
①
与
表示同一函数;
②已知函数
的定义域为
,则
的定义域为
;
③不等式
对于
恒成立,则
的取值范围是
;
④对于集合
,
,
若
,则
的取值范围
,其中正确说法的序号是______ .
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b3e897dea11f9b673c1ad2d5878bdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9727cca4ae89db26bfa2f8b2bb76c8c4.png)
②已知函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d275fbb3ee5cd1177ca5a2ceecbbef0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3b1af5d4b930f8989cf63d44768621e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b8dd34d6699daf6eae648c1fae51789.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a4fd84394e897ebf6c4814b841d427b.png)
③不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29e2166990a5abe6f719ddc44580d03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb63478132d4c1fef3c17e591919da83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3213a7a72b5e376ee25efd535398fb7d.png)
④对于集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59df66e355dfa724058cd975240e5f20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ac3ecd5d06ab40ec3f071ea185f7e75.png)
若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c0f0162009195038650a6ccea57352e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3bbd954f890ec2a777fa411c4c313fd.png)
您最近一年使用:0次