2012·广东韶关·一模
解题方法
1 . 已知函数
(
为常数,
),且数列
是首项为2,公差为2的等差数列.
(1) 若
,当
时,求数列
的前
项和
;
(2)设
,如果
中的每一项恒小于它后面的项,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7cf022715d1ef26a65b9348bd5e4d00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe9e329f2730b2be926b121f1ae04c0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c704d7054cbdc9d975d4326091cc5251.png)
(1) 若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e7c7c78f66f4a74f43346d6aa8639fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4875f6b13d20d1389a26ad77cca5bd00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d59b12de2767cc2a5744406b65dbb43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次