![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8fe991dd45e7d07773dd2f043665731.png)
更新时间:2022-04-21 09:54:59
|
【知识点】 裂项相消法求和
相似题推荐
填空题-单空题
|
较易
(0.85)
名校
解题方法
【推荐1】已知数列
的前n项和为
,
,
,设
,数列
的前n项和为
,若
对
恒成立,则实数
的取值范围为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2693734765399876e9e93cdb110231c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d0a77b7f47968db860b049b9726a309.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb1012e6e1603c1b02a2ba9e64764877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2e569bec99bea2fe11eaaf5e4117d7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/030137376417efb2ac10443ff54fbfb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
您最近一年使用:0次
填空题-单空题
|
较易
(0.85)
名校
解题方法
【推荐2】设
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b7397f5c34dd0a34cd9fb76e8487d50.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8ac2eed962bdd61146b57e411344946.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b7397f5c34dd0a34cd9fb76e8487d50.png)
您最近一年使用:0次