已知下列命题:
①命题:“
,
”的否定是:“
,
”;
②若
,则
,
;
③若
,则
,
;
④等差数列
的前
项和为
,若
,则
;
⑤在
中,若
,则
.
其中真命题是________________ .(只填写序号)
①命题:“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fb49f7407b400d314e55972e4376711.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41c338589ee42165471b7a0328508950.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87d374ca687bd81e60d70bf24c99fb8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6e63868933ac4e413af3b78a841edbd.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b586d5da50edf2b5d624b1f3368570eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c780149aef1bd77162e85f7f8906a6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69d88a41a8c39757a1bbcc8ae9052c67.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a81a37e05f73b403777cb6efdb2ca3a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a28e0ab7243fc8133982902400c531f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14d6cd6c41f47a05d68ba4c933dd1761.png)
④等差数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb0abedd59476f8793d5a8948590a70c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26de461c33b78123e272a85ec6a86c7b.png)
⑤在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca51be437b1a97ca92aa1159ab71102c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19dc38d888741a1b2e95fe0773a48c38.png)
其中真命题是
更新时间:2022-04-29 10:20:45
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f342a5660d1fcf6bcb75060f3ed3a6b9.png)
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