1 . 某林场去年底森林木材储存量为100万
.若树木以每年
的增长率生长,计划从今年起,每年底要砍伐的木材量为
万
.记
为第
年年底的木材储存量.
(1)写出
、
;写出一个
和
之间的递推关系,并表示成
的形式,其中k、r为常数;
(2)为了实现经过10年木材储存量翻两番(原来的4倍)的目标,每年砍伐的木材量
的最大值是多少?(精确到0.01万
)(参考数据:
、
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35c901bcdfa58f0c68ad0161b0bab269.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8ee628efd6b2f7296c106dd5cbae42f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35c901bcdfa58f0c68ad0161b0bab269.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(1)写出
![](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/090426eb29836bc30c006b3739c08057.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad5b9774c0f8a04dddcafd0132e052c9.png)
(2)为了实现经过10年木材储存量翻两番(原来的4倍)的目标,每年砍伐的木材量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35c901bcdfa58f0c68ad0161b0bab269.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c32f30476dd520b487d61840c7b7031.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76457b051e729585661f026e859c5cd3.png)
您最近一年使用:0次
解题方法
2 . 已知数列
的前
项和为
,
,
.若
、
、
成等比数列,求
的值.
![](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/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73af653d11c3d6c2673300a6622a5279.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f255d0395fba51ca2d44293cca42e0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0620331265c321c19bc86f418a3e014d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
您最近一年使用:0次
2022-04-08更新
|
271次组卷
|
2卷引用:陕西省2022届高三下学期教学质量检测(二)文科数学试题
2022高三·全国·专题练习
3 . 已知数列{an}为正项等比数列,a1=1,数列{bn}满足b2=3,a1b1+a2b2+a3b3+…+anbn=3+(2n-3)2n.
(1)求an;
(2)求{
}的前n项和Tn.
(1)求an;
(2)求{
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19b8aeb9c72a1c1ce0e8ce2962f33386.png)
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21-22高二下·上海浦东新·阶段练习
4 . 数列
满足
,
,
.
(1)分别求数列
和
的通项公式;
(2)设
,
,若对任意正整数
,不等式
恒成立,求满足条件的整数
的集合
;
(3)若
,
,判断
是否为等比数列?若不是,请说明理由;若是,试求出通项
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c9b6e51986fe5d7a7265e0e93adcb4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c4df8db48d1b6c9a2c2f7fce713027d.png)
(1)分别求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edcf33b2a94eae16760d746f9b4b8dbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8194a62bc60a9da9b5cf76f9dc0fa09.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ee6152ab3f589a4c18ad2e1207e814.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e7dcca2acb8fb6e6a6933a02e0a130b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84104172302c41e20c68c36bc3f4becb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91a7fd7f5af9b9378a20d80c82a4eae4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cedecf643f9aeceb785a79ff3d4712dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a11a78afca8e553a869b386bcb6d29d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c59e7c7a84a4bdb959e95536d0404ceb.png)
您最近一年使用:0次
21-22高二·江苏·课后作业
解题方法
5 . 在等比数列{an}中,
(1)已知a1=1,公比q=-2,求前8项和S8;
(2)已知a1=-
, a4=96,求前4项和S4;
(3)已知公比q=
,前5项和S5=
,求a1, a5.
(1)已知a1=1,公比q=-2,求前8项和S8;
(2)已知a1=-
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
(3)已知公比q=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9918262fe49da9a1031ea451973cb5c0.png)
您最近一年使用:0次
6 . 判断下列数列是否为等比数列:
(1)9,0.9,0.09,0.009;
(2)
,
,
,
;
(3)
,
,
,
;
(4)
,
,
,
.
(1)9,0.9,0.09,0.009;
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4b57c4a905b766f8755d01b28d22a63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/993908fc9c1baaf8774ba080107c23d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dd7d7624d5efbb189205bd3a4a13e3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bac900bd09df30926bbf18dcf94628a.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5498db3231db49529b93fdf13433298a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65f5ca7640f5202cc27dd03190d101e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc6e41b8e683c5d3b71c867b582524a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09a9b9cada684621f0b080058a3582d3.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef25f1fa9539e95e763cd0ef4bf68782.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63b4d1868e26d04a2bd6b30a07d514c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d3e49942ad60434e5ea393f722be9be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/425c4c772403a5d629255d864fe9abf4.png)
您最近一年使用:0次
7 . 已知
是各项均为正数的等比数列,公比为q,求证:
是等比数列,并求该数列的公比.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c133f850a40f4d23c30fa91a1e7d74a2.png)
您最近一年使用:0次
8 . 已知无穷等比数列
的首项为
,公比为q.
(1)依次取出数列
中的所有奇数项,组成一个新数列,这个新数列是等比数列吗?如果是,那么它的首项和公比是多少?
(2)数列
(其中常数
)是等比数列吗?如果是,那么它的首项和公比是多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
(1)依次取出数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83d6249f3f30afde1c02a516b5d1aaf9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fef20073a12bab727faa217718b63414.png)
您最近一年使用:0次
9 . 在等比数列
中,如果对任意的
,都有
,求证:数列
为等差数列.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f093c61867ee4ce75f951d46b9b123.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9645bd4d2002993b90ec6d48f9c04f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4711944aa361bd9f2ed566b24c6888ec.png)
您最近一年使用:0次