8-9高二下·辽宁锦州·期末
1 . 在等差数列
中,有
,其中
分别是
的前
项和,用类比推理的方法,在等比数列
中,有________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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名校
2 . “已知数列
为等差数列,它的前
项和为
,若存在正整数
,使得
,则
”,类比上述结论,若正项数列
为等比数列,__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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3 . 定义变换
将平面内的点
变换到平面内的点
;若曲线
经变换
后得到曲线
,曲线
经变换
后得到曲线
,…,依次类推,曲线
经变换
后得到曲线
,当
时,记曲线
与
、
轴正半轴的交点为
和
,某同学研究后认为曲线
具有如下性质:①对任意的
,曲线
都关于原点对称;②对任意的
,曲线
恒过点
;③对任意的
,曲线
均在矩形
(含边界)的内部,其中
的坐标为
;④记矩形
的面积为
,则
;其中所有正确结论的序号是_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
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4 . 在等差数列
中,若
,则有等式
成立.
类比这一性质,相应地在等比数列
中,若
,则有等式_______
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6fbaaecf683d3158a2d020f2099c873.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93cd7d7082fada5eeda06ae5b1186688.png)
类比这一性质,相应地在等比数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b8dafcd3be708bd03cceb5d62949856.png)
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2021-02-01更新
|
136次组卷
|
2卷引用:广东省深圳实验学校2020-2021学年高二上学期第二阶段考试数学试题
5 . 有以下命题:设
,
,…
是公差为
的等差数列
中任意
项,若
(
,
,
且
),则
;特别是,当
时,称
为
,
,…
的等差平均项.
(1)已知等差数列
的通项公式为
,根据上述命题,则
,
,
,
的等差平均项为:______ ;
(2)将上述真命题推广到各项为正实数的等比数列中:设
,
,…,
是公比为
的等比数列
中任意
项,若
(
,
,
且
),则______ ;特别是,当
时,称
为
,
,…,
的等比平均项.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/718becd70c94d6876d6e33d6dcd476c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdc291ae9071d0d3ebde20a1cd507577.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ab14f60ca1a64d70a4dd5a662c6530e.png)
(1)已知等差数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9260f8989cfd0ffca5a49ffbc0668f14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e35eeaabd951fb09b2926807da3685b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b53c211eecfe7c449b52ace8aef55d58.png)
(2)将上述真命题推广到各项为正实数的等比数列中:设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/718becd70c94d6876d6e33d6dcd476c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdc291ae9071d0d3ebde20a1cd507577.png)
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