1 . 给出下列命题:
①函数
的最小值是0;
②“若
,则
”的否命题;
③若
,则
,
,
成等比数列;
④在
中,若
,则
.
其中所有真命题的序号是______ .
①函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9980b1d5c54f0cbd6f7b3ba99cc9be9f.png)
②“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2053e1f50472a9fed67d4c84d9cb938.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/988b7e964e313579ab8869d67d5be007.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
④在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b610c855735a35d4168ac6a0f72ef904.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/093db5b63dfd1ac4c84692a168f7ace0.png)
其中所有真命题的序号是
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2021-01-28更新
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8卷引用:河南省南阳市2020-2021学年高二上学期期末适应性摸底考试数学(理科)试题