名校
1 . 已知递增等比数列
满足
,则
的前三项依次是__________ .(填出满足条件的一组即可)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ce1db8ea6ca42113d45217ab4133f34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
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2019-04-08更新
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539次组卷
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6卷引用:第一章 数列(能力提升)-2020-2021学年高二数学单元测试定心卷(北师大版必修5)
(已下线)第一章 数列(能力提升)-2020-2021学年高二数学单元测试定心卷(北师大版必修5)【市级联考】云南省昆明市2019届高三复习教学质量检测理科数学试题2019届重庆市南开中学高三下学期月考数学理科试题辽宁省葫芦岛市2021-2022学年高二下学期期末数学试题【市级联考】云南省昆明市2019届高三复习教学质量检测文科数学试题(已下线)模块四 专题2 期末重组综合练(辽宁)(高二人教B)
名校
解题方法
2 . 已知
是无穷数列,且
,给出该数列的两个性质:①对于
中任意两项
,在
中都存在一项
,使得
;②对于
中任意项
,在
中都存在两项
,使得
.
(1)判断数列{2n}和数列
是否满足性质①(直接写出答案即可);
(2)若
,判断数列
是否同时满足性质①和性质②,说明理由;
(3)若
是递增数列,
,且同时满足性质①和性质②,证明:数列
为等比数列.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9645bd4d2002993b90ec6d48f9c04f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4f3a5cd1567f0ec83b7ebb49c3766cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/681ae1522a36768618f7ddaf74abbb7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70054cde112fe45b9d75f4b49f81cfca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf16339dca6781c6a4ad485c4b5a04e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ffa2f783484bfec4389998cf7e21d82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acf674fd486eada093c57c3147586341.png)
(1)判断数列{2n}和数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97f1eaaee5ba6c66cb91fbbf3e6d58a9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc2966bb05a007c40e5a8ae411f534.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
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