已知数列
,
,点
在曲线
上,且
.
(1)求证:数列
是等差数列;
(2)已知数列
满足
,记
为数列
的前n项和,求
,并证明:当
时,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b13a6e1d671215fc96e4bee3541d1096.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a44042d110ad8bf676c2785c2b1f9a04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15e6aa0bdb231e5deb75f14cb6343eab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74f47f53e669af3e665f01a3462581e3.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)已知数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9759f0ff15edeea1a33941530f72904.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efd54e370bb946d98a93c1fc9690f939.png)
更新时间:2022-05-18 14:11:14
|
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(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87bdc58f24200ee4e4ed62581ecc9450.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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解答题-问答题
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适中
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解题方法
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(1)证明:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc9efeb4455e30293d412938eeea85d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b6be4554f03bf496092f1acdfbb89.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/812eb9e193c24dca8feb62ce8b505619.png)
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名校
解题方法
【推荐1】已知数列
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1933b7c3ace69622339353431c519b13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d806abf9558e6be9ce5ba79a79d113ab.png)
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(1)证明:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5344eadd4711db34e3f935aedd5fb270.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b52c9237cb0b4acc568d4afb12997186.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d192ce23fc9dbaa6c44b1e3404dad9aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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您最近一年使用:0次
解答题-问答题
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适中
(0.65)
解题方法
【推荐2】已知函数
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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)
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(2)设
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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