名校
解题方法
1 . 给出以下几个结论:
①若等比数列
前n项和为
,
,则实数
;
②若数列
,
的通项公式分别
,
,且
,对任意
恒成立,则实数a的取值范围是
;
③设在
中,内角A、B、C的对边分别为a、b、c,且
,则
的最大值为
;
④在
中,三内角A,B,C所对的边分别为a,b,c,则
;
其中正确结论的序号为______ .
①若等比数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97b794ed9de8e93de6e067c3d0259558.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e145b6046bc80d0ffecc61ac67c87ca1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b108ab31cc093f03cf48ad65429889e.png)
②若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ae956b7c89f63fcb27a507c9728344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dc7eb66f5d777c283a395eda5635d4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83ac679ad239090a6ce21a10b47e332c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e145b6046bc80d0ffecc61ac67c87ca1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54c30f7465c99d88caf6703bc7365a51.png)
③设在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1f32fe2cea6b046da549c0d04e103e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afd0b09f2c1c75840f0a1a1eb3528ae3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827ccf0c04aa941ba20d5f4c6068b46b.png)
④在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d22b0c674439368ca4d402fe8ce0888.png)
其中正确结论的序号为
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