已知数列
满足,
.
(1)求数列
的通项公式;
(2)若
,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/13f78a88e522d7e1c90f96d3521cb35f.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6df1e8c28789ee186157ec527a7f5199.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.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)
2023·全国·模拟预测 查看更多[2]
更新时间:2023-01-04 12:29:27
|
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解答题-证明题
|
适中
(0.65)
【推荐1】过点
作曲线
的切线,切点为Q1,过Q1作x轴的垂线交x轴于点P1,又过P1作曲线C的切线,切点为Q2,过Q2作x轴的垂线交x轴于点P2,…,依次下去得到一系列点Q1,Q2,Q3,…,设点Qn的横坐标为an.
(1)求数列{an}的通项公式;
(2)求和
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(3)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4b4ca91f9c34da97ffb91195e8beb6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adad22a6fab6dfc049740b5ca5715ce8.png)
(1)求数列{an}的通项公式;
(2)求和
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0556fa7a913dfdba4486bd8284c9f4b1.png)
(3)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fdc002bde3e162e28a57ee1029a0919.png)
您最近一年使用:0次
【推荐2】已知正项数列
中,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e98865121e0697a56cd4d7bd9a97083f.png)
(1)求数列
的通项公式;
(2)记
,求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e98865121e0697a56cd4d7bd9a97083f.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2ed51d1271d706c96dbff53ed9c94d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.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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名校
解题方法
【推荐1】已知数列
的前n项和
.
(1)求
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(2)令
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,数列
的前n项和
恒成立,求实数m的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3d2dd8cb8712c7890b14cf5beedf17f.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(2)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8107120e073023ad75e7eaaddb1636e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e145b6046bc80d0ffecc61ac67c87ca1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
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您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
解题方法
【推荐2】已知正项数列
的前
项和为
,且
.
(1)证明:
是单调递减数列.
(2)求数列
的前
项和
.
![](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/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9414ae506432940ceedbc1281d5e4ef.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a7e5f8fa3e301c1caae126d5bb13f5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
您最近一年使用:0次