名校
1 . 已知
,则这个数列的前100项中的最大项与最小项分别是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05559282e65eb118752a0cf940ad25a5.png)
A.![]() ![]() | B.![]() ![]() | C.![]() ![]() | D.![]() ![]() |
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解题方法
2 . 设数列
的前
项和为
,已知
,
是公差为2的等差数列.
(1)求
的通项公式;
(2)若
,设数列
的前
项和
,求证:
.
![](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/5ecf69901899bba130968c7a091790d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53955b3deab12fa506241a683ad02d71.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d289d8e284958dbe5e78494e37f3149.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/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f90c342e24dd2af11c6ab820df7a549.png)
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解题方法
3 . 记数列
的前
项和为
,且
.
(1)求数列
的通项公式;
(2)设
,证明:
.
![](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/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97db527fd3d74206b20df0f5ec318bbf.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c60af883387104aefde8d845676dcdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/318701b52d3102cae111b54f1b0360ac.png)
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4 . 一质点在平面内每次只能向左或向右跳动1个单位,且第1次向左跳动.若前一次向左跳动,则后一次向左跳动的概率为
;若前一次向右跳动,则后一次向左跳动的概率为
.记第n次向左跳动的概率为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e948956b4ef1bb5fa3c09fbda213dee.png)
________ ;![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f11c04103c0e5416897894d9225637b2.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ffb021aa7d5a5c2f0691e337caad624.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e948956b4ef1bb5fa3c09fbda213dee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f11c04103c0e5416897894d9225637b2.png)
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名校
解题方法
5 . 设正数数列
的前
项和为
,且
,则( )
![](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/70d1a2fb79867e67c5e8d7bbb68e7fd4.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
6 . 已知数列
的前n项和为
,且满足
.
(1)求
及
;
(2)若
,求满足条件的最大整数n的值.
![](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/f45f16c10ebebdfea2aae2029c94d131.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec4dce359876d43a468b772000795c8b.png)
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解题方法
7 . 已知数列
的前n项和
满足
,
(1)求数列
的通项公式;
(2)若
,
,求使
成立的正整数n的最小值.
![](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/8c82fc2dccf11e3b0336893665e1df36.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16a3cba7173a64405b1b36ebb416e834.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd597fd3e8cf7d5fb0de8c0f18bd785c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6cf2cd4b45e2bf146c2eae9131ab895.png)
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解题方法
8 . 已知数列
的前n项和为
,则下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a29df9821a60809eb0af27317b113fbb.png)
A.![]() | B.使![]() |
C.使得![]() | D.![]() |
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解题方法
9 . 已知数列
的前
项和分别为
,若
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62e567d7e9761951a266953c8d5042ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/478421b81927e435cbcf5acafa89efd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49677329c86ce5b576c55af1b12817cd.png)
A.![]() | B.![]() |
C.![]() ![]() | D.![]() ![]() |
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解题方法
10 . 已知数列
的首项
,且满足
.
(1)求
的通项公式;
(2)已知
,求使
取得最大项时
的值.(参考值:
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7508a63d0d5e6baf68c0765596f3627a.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc4083aeaa11c0f3b3985e654735def3.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/5638d4addea4a438000584d81da1c5da.png)
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