1 . 已知
.给出下列结论:①
;②
;③存在
,使
;④存在
,使
.其中,正确结论的序号为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/025d8f85233cdc40a41d36d55f70eb4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c73a98c1b3504e09bfbe0db849b0d24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a71baf6217604517fd98fa97d0f55b43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f7dbb416ec1ff1984a724a4f48bf692.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c36825543013336c9df727bc51ff62c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f7dbb416ec1ff1984a724a4f48bf692.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92755ed40510a358dcb77392749fd792.png)
您最近一年使用:0次
2 . 给出下列命题:
①
;
②若
,则
;
③若
,则
;
④若
、
,
,则
.
其中,正确命题的序号为______ .
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8ebc553c60f28b5c67843f2db951ff7.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d42c49064a9c51c13cacb822e327336.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a1f1d909f18e5cf13c48762f2a31080.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6eec7d75a66a4407631f75320bb8b15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17eec784c002a80ba88c7f2e1b895b52.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ca5fd57c2c2fcc3c7a574fdd1467d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20c11f6c800b8e0410674a0c6d307d26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4bc9bd873f21d1470ad0810259e084e.png)
其中,正确命题的序号为
您最近一年使用:0次