已知
为等差数列
的前
项和,且
,给出下列说法:
①
为
的最大值;②
;③
;④
.其中正确的是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](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/2f0fb2f484d3d73b26acc02ffdc56a3d.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a48e81b54f78b96294295542b010dfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15d4688b8b20ecd1c8f6e3fa0b1eab62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce868ac245a30cc99db2b35b2fabc545.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b67514a8237b3fe4d0d737fc274b4c4.png)
更新时间:2020-03-20 08:42:15
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