名校
1 . 设等比数列
的首项为
,公比为
,所有项和为1,则首项
的取值范围是____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c22c96b4d06bc3172cbeb08f4e8c4d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
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2 . 已知等比数列
的首项为1,公比为
,
表示
的前
项和,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6eb2fcf76cd58f6573a059ab1ab48b4.png)
_____
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3389f53711264b0acba3ba6019f8b908.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6eb2fcf76cd58f6573a059ab1ab48b4.png)
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3 . 已知数列
,
,
,则
=______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80c0062e5a519fd16ebe52ff2ba086b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4e92d98960c31576768790fdd9c0e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36b98ef143f8159f3a7dafa1fd2f2370.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/980b58d5b67d26bd2a392d6dd07ed666.png)
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2010高二·全国·竞赛
名校
4 . 等比数列{
}的首项为
=
公比为q,则
…![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a585babd763c9bdd0a1d699460825f9.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bfccafa83afe5ee21eab6ef2b2c8852.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b42791b77924729f7e31712177b26af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d100d4252012a4f7ae0fbcd611c24a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74999575ca364f189fbc2e7114a53704.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7befa401417140424a9c03baf47b0ba7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a585babd763c9bdd0a1d699460825f9.png)
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5 . 化小数为最简分数:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf151fe47faef4cd86bcd5d2e59b4467.png)
________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf151fe47faef4cd86bcd5d2e59b4467.png)
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6 . 若无穷等比数列
的各项和为
,则
的取值范围是________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
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7 . 已知数列
的通项公式
,那么使得其前
项和
大于7.999的
的最小值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3da3e2f057edeef37cc0e3bf63a1cd0.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/b6a24198bd04c29321ae5dc5a28fe421.png)
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2011·上海静安·一模
8 . 设二次函数
,对任意实数
,有
恒成立;数列
满足
.
(1)求函数
的解析式和值域;
(2)试写出一个区间
,使得当
时,数列
在这个区间上是递增数列,
并说明理由;
(3)已知
,是否存在非零整数
,使得对任意
,都有
恒成立,若存在,求之;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21ccc267e57f4ddf3ff7eebddb9506de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76c0bd88ad30e02ee640eab5152d7a31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cfb19f0c37a72b33083ae9319f11a74.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)试写出一个区间
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30277e0be448b4955903e81e8795e45d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd7f3da15610918720feb933c72053c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
并说明理由;
(3)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14835bf3f00139ccec0694d0924db795.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36b98ef143f8159f3a7dafa1fd2f2370.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8e6c05c27ebf006a73c6ead9ed3e1f2.png)
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9 . 已知无穷数列
满足
(
).其中
均为非负实数且不同时为0.
(1)若
,且
,求
的值;
(2)若
,
,求数列
的前
项和
;
(3)若
,
,求证:当
时,数列
是单调递减数列.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3659e090865f9763677c7351b2f28fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cd5371a6f0f82c65dd22f75f8b807c1.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaffec44406a4313cacb06a7b56b904.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c98d10092efc21e76783c0cd5fb5ad38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6065aaa8f3f103d1bc960da8318ce35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/085b7f021a79ec95dac1f7b56769774e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfa9bf65189dfb57a61644a1cb27f361.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f6c2c571ce7e333bc0251bc2c1af538.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
您最近一年使用:0次
10 . 已知无穷数列
满足
(
).其中
均为非负实数且不同时为0.
(1)若
,且
,求
的值;
(2)若
,
,求数列
的前
项和
;
(3)若
,
,且
是单调递减数列,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3659e090865f9763677c7351b2f28fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cd5371a6f0f82c65dd22f75f8b807c1.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaffec44406a4313cacb06a7b56b904.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c98d10092efc21e76783c0cd5fb5ad38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6065aaa8f3f103d1bc960da8318ce35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/085b7f021a79ec95dac1f7b56769774e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfa9bf65189dfb57a61644a1cb27f361.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
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