名校
1 . 已知方程
的正根构成等差数列,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d688733a01b1bc9ac801100c50c60f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd707b69a11f8de5566f23c1a2a9ff5a.png)
A.![]() | B.![]() | C.2 | D.4 |
您最近一年使用:0次
2024-06-14更新
|
67次组卷
|
2卷引用:河北省邯郸市部分示范性高中2024届高三下学期三模数学试题
2 . 若
是等差数列
的前
项和,且
,则
的值为_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/597de5df9732bb6a4241b7ee6f531746.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b87df689b605e7a283b56d454c3736a0.png)
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3 . 已知数列
则
是该数列的
![](https://img.xkw.com/dksih/QBM/2016/1/12/1572428548292608/1572428553723904/STEM/65c8b7b752b542efb186f2ab46715d01.png)
![](https://img.xkw.com/dksih/QBM/2016/1/12/1572428548292608/1572428553723904/STEM/6edf6e4da77e41f39c3f7884ed26732b.png)
A.第16项 | B.第17项 | C.第18项 | D.第19项 |
您最近一年使用:0次
4 . 若
是等差数列
的前
项和,且
,则
的值为_________ .
![](https://img.xkw.com/dksih/QBM/2016/2/24/1572495818792960/1572495824748544/STEM/ff931c7321504a5c89f226e8e7ebe2d2.png?resizew=19)
![](https://img.xkw.com/dksih/QBM/2016/2/24/1572495818792960/1572495824748544/STEM/b9e1f041a2854085ad0c85c55711df3f.png?resizew=32)
![](https://img.xkw.com/dksih/QBM/2016/2/24/1572495818792960/1572495824748544/STEM/6bd4fba5370748a3aed2bc3440d3f15d.png?resizew=13)
![](https://img.xkw.com/dksih/QBM/2016/2/24/1572495818792960/1572495824748544/STEM/46cccbd66a7c4b56933b753f495ed266.png?resizew=80)
![](https://img.xkw.com/dksih/QBM/2016/2/24/1572495818792960/1572495824748544/STEM/f3fce56961034d43a9169a11a04f0ae2.png?resizew=21)
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5 . 已知
为数列
的前项和,
且
是
与
的等比中项.
(1)求数列
的通项公式;
(2)若
为整数,
,求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3181795253649112de36ffe994270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd9903b063c08d9d3ada396cf598cc21.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a937c752f5e8d5e2a37872262ddc4978.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b7e7cd571c8cd141cbbfe5d0890bf6.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
2017-02-08更新
|
293次组卷
|
2卷引用:2017届河北磁县一中高三11月月考数学(文)试卷
6 . 已知等差数列{
}和正项等比数列{
},
=1,
=9,
是
和
等比中项.
(Ⅰ)求数列{
}、{
}的通项公式;
(Ⅱ)若
,求数列{
}的前n项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686ece75006ad358f23314dc8a246e11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89fe0f4e8a80a2840c0f6929a8a6351b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65391f7ecbb7ad35330cd9668596dd34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fd71bc7e6668f90f259ad0b06dd60c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57483e04fd1840c87ac5325157149877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86ada2c9f82459340da96274ee60ffbd.png)
(Ⅰ)求数列{
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686ece75006ad358f23314dc8a246e11.png)
(Ⅱ)若
![](https://img.xkw.com/dksih/QBM/2016/5/5/1572618199646208/1572618205847552/STEM/5e7a1a74125446f1b1fe958cc9fd8d0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c59e7c7a84a4bdb959e95536d0404ceb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
您最近一年使用:0次
2016-12-04更新
|
529次组卷
|
2卷引用:2015-2016学年河北省成安县一中高二1月月考文科数学试卷
7 . 等差数列
中,
,公差
且
成等比数列,前
项的和为
.
(1)求
及
;
(2)设
,
,求
.
![](https://img.xkw.com/dksih/QBM/2015/2/10/1571987247874048/1571987253190656/STEM/2d74c64bfc1b426c9700100f3413126b.png)
![](https://img.xkw.com/dksih/QBM/2015/2/10/1571987247874048/1571987253190656/STEM/8fba2c511c124816864d83967e1c1a5a.png)
![](https://img.xkw.com/dksih/QBM/2015/2/10/1571987247874048/1571987253190656/STEM/6db3f9cc67e8476b9f39aa43d8c40007.png)
![](https://img.xkw.com/dksih/QBM/2015/2/10/1571987247874048/1571987253190656/STEM/1cbcc11398f741bfb9a101ace75d7018.png)
![](https://img.xkw.com/dksih/QBM/2015/2/10/1571987247874048/1571987253190656/STEM/20cfeb5c23a94eaeafe96464ab028cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(1)求
![](https://img.xkw.com/dksih/QBM/2015/2/10/1571987247874048/1571987253190656/STEM/27ec4af3621b44b1b998018c486793c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(2)设
![](https://img.xkw.com/dksih/QBM/2015/2/10/1571987247874048/1571987253190656/STEM/837c87df54c341979cbefb7e682d420a.png)
![](https://img.xkw.com/dksih/QBM/2015/2/10/1571987247874048/1571987253190656/STEM/af268f4e524d4ecb803a0c73ae753673.png)
![](https://img.xkw.com/dksih/QBM/2015/2/10/1571987247874048/1571987253190656/STEM/c3230a31a3764fa08e47f399ff3cabc6.png)
您最近一年使用:0次
2016-12-03更新
|
826次组卷
|
3卷引用:2015届河北省邯郸市高三上学期1月份教学质量检测理科数学试卷
8 . 已知等差数列
中,前10项的和等于前5项的和.若
则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f1a487bae5d328ef9ce3632c9f73d0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
A.10 | B.9 | C.8 | D.2 |
您最近一年使用:0次
2010·河北邯郸·二模
名校
9 . 设
为等差数列,
为其前
项和,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adf14ebc775db2414a5a960badca8960.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.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/30a1097dc7b15dadf3bacc1f28cb048d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adf14ebc775db2414a5a960badca8960.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
10 . 设数列
是以3为首项,1为公差的等差数列,
是以1为首项,2为公比的等比数列,则
=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d737c1047a14cee12a6671383e244fa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a89d1f32c1605cfdb8e8855051b9f6ec.png)
![](https://img.xkw.com/dksih/QBM/2016/1/8/1572425959448576/1572425965150208/STEM/52cad56cabd14895be6377e40fe98594.png)
A.15 | B.72 | C.63 | D.60 |
您最近一年使用:0次
2016-12-03更新
|
643次组卷
|
3卷引用:2015-2016学年河北省成安一中、永年二中高二上期中理科数学试卷