1 . 已知
是等差数列,
是其前
项和,若
,则
的值是_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25e7827ead259994b9cfd5b8b3e440a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba48780e63a87aaf7f1d7fa29dd56b5c.png)
您最近一年使用:0次
2017-07-01更新
|
685次组卷
|
2卷引用:江苏省淮安市2016-2017学年高一下学期期末考试数学试题
2 . 设无穷等差数列
的前
项和为
,已知
,
.
(1)求
与
的值;
(2)已知
、
均为正整数,满足
.试求所有
的值构成的集合.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe229b24e2d56ff6b491725ceae4ff2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b708c8dcb2d66eb2ce0b3718a9cd924a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/381576e698a46df8c497e6b5f8346ddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea18cff50cf680eaaecfd64b5821c893.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90d1ea5970caa98b243014d9b3c9cc69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5da7db94be3058f79e3f2d5185fd7a7d.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d128261048f87d7e2c533ddd66c46516.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
您最近一年使用:0次
3 . 已知
是各项均为正数的等差数列,其前
项和为
,且
.
(1)求数列
的通项公式;
(2)若数列
的前
项和为
,且
,
.
①求证:数列
是等比数列;
②求满足
的所有正整数
的值.
![](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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4578c02324ba73e61b82da2e1cc8458f.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59dd6c97d2ee3e74ba5730f1cbcc1d43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb73c1f21605711268e6c9f0a7bbb880.png)
①求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
②求满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/070b130f085fd5afe165f3349fdedddb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
您最近一年使用:0次
4 . 在等差数列
中,公差
,且
成等比数列,则
的值为____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/812be9806122241c476ba1db516c4823.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a21697aa5b53b64ca5d69014b1cd8008.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09e151e8083936ff799a0f27c54704d9.png)
您最近一年使用:0次
2017-06-29更新
|
329次组卷
|
2卷引用:江苏省宿迁市2016-2017学年高一下学期期末考试数学试题
名校
5 . 已知
为公差不为零的等差数列,其中
成等比数列,
.
(1)求数列
通项公式;
(2)记
,设
的前
项和为
,求最小的正整数
,使得
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a18556fda4a825861f1170cdeb059ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28d84ee688592caf22e84910db79e7d0.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50a813139b92a24e1124ef96e3e485f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f366101c6ddf083aea62e38a1a2b483.png)
您最近一年使用:0次
2017-06-23更新
|
529次组卷
|
3卷引用:黑龙江省佳木斯市第一中学2016-2017学年高一下学期期末考试数学试题
名校
解题方法
6 . 设等差数列
的公差为
,前n项和为
,已知
,
.
(1)求数列
的通项公式;
(2)若
,
为互不相等的正整数,且等差数列
满足
,
,求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82ee48233a541062b922053a35d28209.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2fcd86b9ed6819116a261629f96fae1.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4a98616bb27813af3218ab3d3fe3937.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60b8fdb5e9e24c7f4fee7aab149e4ee7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
您最近一年使用:0次
2017-06-22更新
|
586次组卷
|
3卷引用:江苏省苏州市2016-2017学年高一下学期高一期末数学模拟试题
7 . 如图所示的“数阵”的特点是:每行每列都成等差数列,则数字
在图中出现的次数为__________ .
![](https://img.xkw.com/dksih/QBM/2017/7/12/1728354940780544/1728568811601920/STEM/48f7164c68654d6895dd6773e8ca5a40.png?resizew=18)
![](https://img.xkw.com/dksih/QBM/2017/7/12/1728354940780544/1728568811601920/STEM/cf2cb25df68f4ae18206369f200b4f04.png?resizew=207)
您最近一年使用:0次
2017-06-10更新
|
134次组卷
|
2卷引用:福建省泉州市泉港区一中2016-2017学年高二下学期期末考试数学(理)试题
8 . 如图所示的“数阵”的特点是:每行每列都成等差数列,则数字
在图中出现的次数为__________ .
![](https://img.xkw.com/dksih/QBM/2017/7/12/1728354940780544/1728568811601920/STEM/48f7164c68654d6895dd6773e8ca5a40.png?resizew=18)
![](https://img.xkw.com/dksih/QBM/2017/7/12/1728354940780544/1728568811601920/STEM/cf2cb25df68f4ae18206369f200b4f04.png?resizew=207)
您最近一年使用:0次
名校
解题方法
9 .
是公差不为0的等差数列,
是公比为正数的等比数列,
,
,
,则数列
的前
项和等于__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b7e7cd571c8cd141cbbfe5d0890bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebaf2a2590bb84d646957f913d78f6dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab69f14c8d3a68fe7532e0f8d69c6d5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baddf5982021a90642c59b0a21876a09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/731e60bc5b0bd0b66a3ebb2b73b5d2cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
您最近一年使用:0次
2017-05-18更新
|
956次组卷
|
3卷引用:河北省衡水中学2016-2017学年高二下学期期末考试数学(文)试题
解题方法
10 . 已知各项均不相等的等差数列
满足
,且
成等比数列.
(1)求
的通项公式;
(2)若
,求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a18556fda4a825861f1170cdeb059ff.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a49525abe4300b17aa2fd25fc2f072f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
您最近一年使用:0次
2017-04-11更新
|
599次组卷
|
4卷引用:安徽省亳州市第二中学2017届高三下学期教学质量检测数学(理)试题