名校
1 . 已知数列
为等比数列,
,
为函数
的两个零点,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5da4cd81500bdb43118150dbdb1541e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/067dabdfe1a8a9950c3e3d4d9eae6199.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd156a6a1ea00c357b79cfb903799eeb.png)
A.10 | B.12 | C.32 | D.33 |
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2 . 已知数列
是公比不为1的正项等比数列,则
是
成立的( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cbeede118c407a800b05757b9a1393e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e9a03ac8c7424aeaeaf4677ccd43be4.png)
A.充要条件 | B.充分不必要条件 |
C.必要不充分条件 | D.既不充分也不必要条件 |
您最近一年使用:0次
名校
3 . 在各项均为正数的等比数列
中,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49069d75d41c1b07fca7cf7161e39f43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26a1b0c8241b62b7732d64e270376eaa.png)
A.2 | B.3 | C.![]() | D.![]() |
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2024-04-26更新
|
739次组卷
|
2卷引用:四川省成都市蓉城名校2023-2024学年高二下学期期中考试数学试题
23-24高二下·全国·课前预习
4 . 知识点05等比数列的性质
1、“子数列”性质
(1)对于无穷等比数列
,若将其前
项去掉,剩余各项仍为等比数列,首项为
,公比为
;
若取出所有的
的倍数项,组成的数列仍为等比数列,首项为
,公比为
;
(2)相隔等距离的项组成的数列仍是等比数列,即
仍是等比数列,公比为 ____ ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7ee88f532329c9fbc70d6c544497292.png)
2、“下标和”性质:在等比数列
中,若
,则____ ;
(1)特别地,
时,____ ;
当
时,____
(2)若数列
是有穷数列,则与首末两项“等距离”的两项的积等于首末两项的积,即![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4ddaf21329cb1824329c296eaad5336.png)
3、两等比数列合成数列的性质:若数列
是项数相同的等比数列,
是不等于0的常数,则数列
也是____ .
1、“子数列”性质
(1)对于无穷等比数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/217b927efe12a98e1082ecd7f035b921.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
若取出所有的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f255d0395fba51ca2d44293cca42e0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e248261e3017741f15614caea31d0ce0.png)
(2)相隔等距离的项组成的数列仍是等比数列,即
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b7802fa4893785d5a8f6ea1edb8cffe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7ee88f532329c9fbc70d6c544497292.png)
2、“下标和”性质:在等比数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f0c04bf4f330778a67c31371c5cf64.png)
(1)特别地,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d35a47bf120bdc9294da261220947532.png)
当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/865b6be02589dde9a2fb834ee7b8004b.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4ddaf21329cb1824329c296eaad5336.png)
3、两等比数列合成数列的性质:若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed48c3e5c53eba20c2e262b7d2c09bfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50e60f14235ca70ecc310820a747a548.png)
您最近一年使用:0次
5 . 已知等比数列
满足
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dbd9ff686703cad03aa383e5fec21.png)
______ .
![](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/3e8c45e4c4ab30665338dd87a2258f23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dbd9ff686703cad03aa383e5fec21.png)
您最近一年使用:0次
2024-03-21更新
|
614次组卷
|
2卷引用:广东省茂名市信宜市2023-2024学年高二上学期期末数学试题
6 . 在等比数列
中,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0313eea2c65393728d83a287a8b799.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/275a2e0ca9de91a2e64c4c438a60bd85.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
名校
解题方法
7 . 若等比数列
的第2项和第6项分别为3和12,则
的第4项为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
A.4 | B.![]() | C.6 | D.![]() |
您最近一年使用:0次
8 . 在等比数列
中,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59e93dd803f85ed590cbc57e182b90e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de734c800e4e914195d481ee96660f9d.png)
A.2 | B.4 | C.8 | D.16 |
您最近一年使用:0次
9 . 已知
为等比数列,若
,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c99f934db5cefbfe132654330fd391ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de54dd67b9beaf943b06b5f89bce1884.png)
A.2 | B.4 | C.8 | D.16 |
您最近一年使用:0次
10 . 在等比数列
中,
,
,则
( )
![](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/a316124e688e76d6f330ffbea49d427d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dbd9ff686703cad03aa383e5fec21.png)
A.14 | B.16 | C.28 | D.32 |
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