已知函数
的定义域为N+,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d1d50f8a35319bd0725f8fc5ee14990.png)
(1)求f(3)、f(4)的值;
(2)记
求证:数列
是等比数列;
(3)求(2)中数列
的通项公式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f6bfdb24ecf5da863405c2b40936ff9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d1d50f8a35319bd0725f8fc5ee14990.png)
(1)求f(3)、f(4)的值;
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0760d26552d695d0797f63ad831b35cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac6d7512f83e15bdcc3b8093470c1b07.png)
(3)求(2)中数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29518f13a1ebc3fff8181c2d7cfba22f.png)
2011·四川广元·一模 查看更多[1]
(已下线)2011届四川省广元市高三第一次诊断性考试理科数学卷
更新时间:2016-11-30 15:24:15
|
相似题推荐
【推荐1】已知数列
满足
,
.
(1)记
,求数列
的通项公式;
(2)记
,
为数列
的前
项和,求证:
.
![](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/f1ea31cb605a0d052a38cf7bf09b4f7a.png)
(1)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88d48868b259993d0000b7c47525ebcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/593e1ecbd57b9979299eff6c191effa3.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/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d67531daf38519df6cb121b8de3b5773.png)
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【推荐2】甲题型:给出如图数阵表格形式,表格内是按某种规律排列成的有限个正整数.
![](https://img.xkw.com/dksih/QBM/2018/5/31/1957221907505152/1962794344169472/STEM/78bec7d5452342e588b263ba53f5b722.png?resizew=360)
(1)记第一行的自左至右构成数列
,
是
的前
项和,试求
的表达式;
(2)记
为第
列第
行交点的数字,观察数阵请写出
表达式,若
,试求出
的值.
![](https://img.xkw.com/dksih/QBM/2018/5/31/1957221907505152/1962794344169472/STEM/78bec7d5452342e588b263ba53f5b722.png?resizew=360)
(1)记第一行的自左至右构成数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cef98152f1920414469b021c514ec96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cef98152f1920414469b021c514ec96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/160992a68d32742aab97107781f5df49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/160992a68d32742aab97107781f5df49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6b3dc28012bcb595971b7f72098e3f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280860dd039e1305a5ccc455f63e8223.png)
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【推荐1】设数列
的前n项和为
,已知
为常数)
.
(1)求
的值;
(2)求数列
的通项公式;
(3)记集合
,若
中仅有3个元素,求实数
的取值范围.
![](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/e649d6c1298659cf2a6f7eeeaea18bef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f1698e26984ca368065f557f9e1be4d.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cd5371a6f0f82c65dd22f75f8b807c1.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(3)记集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1a5b16fe3d48cfa28cf14eaaad36f63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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【推荐2】设各项均为正数的数列
满足
.
(1)若
,求
,并猜想
的值(不需证明);
(2)若
对
恒成立,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f75b14478c90d02c76aaaf2988ef2131.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ee45219629dd30af171588e646f8b12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31c932d437f90d874026f052d65a8402.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5a9219209bd4544432b4ecbc97741af.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/313351b6025c5f0d3b4f4e2416bcbd2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
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解答题-问答题
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较难
(0.4)
解题方法
【推荐1】已知实数列{
},
|满足
.数列{
}是公差为p的等差数列,数列
是公比为p的等比数列.
(1)若
,求数列{
}的通项公式;
(2)记数列
,
的前n项和分别为
,
.若
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b7e7cd571c8cd141cbbfe5d0890bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e1ecb4496261accb7611f75e9bb9037.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/215c0a9a273de67b95fbbe22dcd90b49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c2da88be606b116c847d0e3b7ba93a1.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7acff98078cdd32804d8f1c4efbe2ddd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(2)记数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea49f8a2b98b542b1ebb2ac813346c90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96f42e60dcbccbdbab9643d323b4398f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee5d95a2662414bf57b1449ff7a3ea27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bd7994cf5e961f9cefe77b7ef6737a1.png)
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【推荐2】已知数列
满足
,其中
.
(1)若数列前四项
,
,
,
依次成等差数列,求
,
的值;
(2)若
,且数列
为等比数列,求
的值;
(3)若
,且
是数列
的最小项,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfec8f3c954d83486d7846459f6d994d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d6024fd3d71da587d8df3a0c28e7840.png)
(1)若数列前四项
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf464629fa321a6ff7401ab79f07083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3b711804687540cdcfc5d2c2b42378b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194b8ab194c7d299d5c3e0f09ec18384.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f65fc200f10b97588a0c9896277c9c64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
您最近一年使用:0次
【推荐1】已知数列
满足
,
.
(1)若
.
①设
,求证:数列
是等比数列;
②若数列
的前
项和
满足
,求实数
的最小值;
(2)若数列
的奇数项与偶数项分别成等差数列,且
,
,求数列
的通项公式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ecf69901899bba130968c7a091790d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6f35fa103e2d4cfb68dc624dc45608d.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a02406a705cc907d9b10d357ecd75d0.png)
①设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5653b60d16ec4e653518f0562680250.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
②若数列
![](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/092ca5b38162baec2623429f779769a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76eea00353d77fffc77442f8f138bcda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a81b6f7856308f3a8badd3d39329c879.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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较难
(0.4)
【推荐2】若数列
满足
,则称数列
为“平方递推数列”.已知数列
中,
,且an+1=an2+2an,其中
为正整数.
(1)证明数列
是“平方递推数列”,且数列
为等比数列;
(2)设(1)中“平方递推数列”的前
项积为
,即Tn=(a1+1)(a2+1)…(an+1),求
;
(3)在(2)的条件下,记
,求数列
的前
项和
,并求使
的
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e5eaabd730c048ddab34542386ce025.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e49108f8d3a5fb4a6b8d1ae1ec7972e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e5eaabd730c048ddab34542386ce025.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/366dfedff1a1a96ec27650375b680059.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(1)证明数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1413bc2c9162794f2dde9193684696e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63e903a9cc9e3a669d7a3f4b40e09bbe.png)
(2)设(1)中“平方递推数列”的前
![](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/406371cec49a82dff63e503c3122be03.png)
(3)在(2)的条件下,记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d8ae40082c3abb1688ffc6be78ad05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b7e7cd571c8cd141cbbfe5d0890bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://img.xkw.com/dksih/QBM/2016/8/4/1572958544216064/1572958549925888/STEM/38bd5d7afdec4e65982c61e868fe16be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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