名校
1 . 已知等差数列
中,
,
,若
,则数列
的前9项和等于______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7def23f30138e0b7c4c1e498d6903a6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad30249f4c029f04e602e7a349006b97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d35f5a7bf8a2b89dbfc049a96dc7cbfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b7e7cd571c8cd141cbbfe5d0890bf6.png)
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16-17高一下·上海浦东新·期末
名校
2 . 数列
满足:
(
且为常数),
,当
时,则数列
的前
项的和
为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7fab51121848ce166035ceab6f4e00b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1e69392d21261afd8e5e5f096634669.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7decbd5385d7075aa319ffc1bff79190.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6f9592eabfc91de9786e9f564338eea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0efba7147f5b9ced8bc4a72f0a9fb8af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08c9965a04c2a6de04e949a15762f372.png)
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3 . 如果
,
,则
的值为________ (用分数形式表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d29172d5295c2aca7356be4e9c4397da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bcaef237c98882ac760b9d26965c2a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8175dc312ec0253da31d0785db4c40c6.png)
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4 . 已知等差数列
的公差为2,前n项和为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/084a1dfde32631bf93a5299ea3363559.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/084a1dfde32631bf93a5299ea3363559.png)
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名校
5 . 设
是等差数列
的前
项和,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e4487468ab2823d6dbf7f0ebd2eb38.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/72ec42a1fb4d702c725f469141866bad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e4487468ab2823d6dbf7f0ebd2eb38.png)
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名校
6 . 定义
为数列
的均值,已知数列
的均值
,记数列
的前
项和是
,若
对于任意的正整数 n 恒成立,则实数 k 的取值范围是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45ba61615feee365148a9414e0b24dda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d935e25db28c6ec9b7ae700cd335edbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071c744a45fd2d97a3e616a04495ff6b.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/315a8e646883171607812e0566d37b4e.png)
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2020-01-07更新
|
566次组卷
|
4卷引用:上海市浦东新区八校2016-2017学年高三下学期3月联考数学试题
7 . 若无穷数列
的所有项都是正数,且满足
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19207cc9f93b4bc4b13e9a9599d2b9b0.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8ac7abb868870531be5402d80677734.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19207cc9f93b4bc4b13e9a9599d2b9b0.png)
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2020-01-06更新
|
378次组卷
|
5卷引用:上海市进才中学2017-2018学年高一下学期期末数学试题
名校
8 . 已知
是等差数列,
,
,则过点
,
的直线的倾斜角为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d9e237c2ee94bfa45886756371d401e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2fefbae840ade8ca814c0e310b06eca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e07e6fbedb62c5e3deed8a6a47802e8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84ffd4845fc97ab115ae13cc90a1ffc9.png)
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2020-01-05更新
|
189次组卷
|
2卷引用:上海市实验学校2017-2018学年高三下学期第五次3月月考数学试题
名校
9 . 设等差数列
的前
项和为
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a02d7c876c0346bca51fce846e0f59c.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/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/085d9498eb6b917cf2e855316ddac5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a02d7c876c0346bca51fce846e0f59c.png)
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2019-12-11更新
|
244次组卷
|
3卷引用:上海市建平中学2017-2018学年高三上学期12月月考数学试题
名校
10 . 若等差数列
的前n项和为
,
,
,则数列
的通项公式为________ .
![](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/cd807f60189a561ac93ed025445c787e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68056fe9240de51e0e91b00c348f817b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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2019-12-10更新
|
586次组卷
|
6卷引用:2017年上海市建平中学高三三模数学试题