解题方法
1 . 等差数列
的公差为d,数列
的前n项和为
.
(1)已知
,
,
,求m及
;
(2)已知
,
,
,求d.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40f4e1236d7dc0366d9523d0cbb426be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3e2f2e4ec975aabd9fc243499cbb49e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/900d813a0b5fae0c339e8c1540a99c7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/681ae1522a36768618f7ddaf74abbb7e.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c94b66d100f907b537ce649e9583dbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d97c178e18425dae5434511b2335223e.png)
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解题方法
2 . 已知等差数列
的前3项和是24,前5项和是30.
(1)求这个等差数列的通项公式;
(2)若
是
的前n项和,则
是否存在最大值?若存在,求
的最大值及取得最大值时n的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(1)求这个等差数列的通项公式;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
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名校
3 . 已知
是等差数列
的前
项和,且满足
,则
( )
![](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/5da6c69ace952e0d9c4defd637be494b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/614306cc3f34bdee4d5d885b79667645.png)
A.25 | B.35 | C.45 | D.55 |
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解题方法
4 . 设
为等差数列
的前
项和,若
,则
( )
![](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/61b59818ae4613a1b018b83da9a6b538.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae9ad4e59d7081cf19021423a984bc29.png)
A.8 | B.12 | C.18 | D.24 |
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名校
解题方法
5 . 在等差数列
中,
,则此数列的前13项的和等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65b1aa21545090a8118367987ea9cff9.png)
A.8 | B.26 | C.13 | D.162 |
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6 . 设等差数列
的前
项和为
,
,
.
(1)求
的通项公式;
(2)设数列
的前
项和为
,求
.
![](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/5a0313eea2c65393728d83a287a8b799.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5032706dd285c22e149c675da465d9ac.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b91adba8efbf964e9e35547b0fd0ea36.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/e3cf40c3b4e46c1c52d7eadff64a9ec4.png)
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7卷引用:陕西省汉中市汉台区2024届高三上学期第四次校际联考数学(文)试题
陕西省汉中市汉台区2024届高三上学期第四次校际联考数学(文)试题陕西省汉中市汉台区2024届高三上学期第四次校际联考数学(理)试题陕西省西安市西咸新区2024届高三上学期模拟考试数学(文)试题河北省石家庄市第二中学2024届高三上学期第一次模拟测试数学试题(已下线)第一章 数列(单元基础检测卷)-2023-2024学年高二数学同步精品课堂(北师大版2019选择性必修第二册)(已下线)黄金卷02(2024新题型)北京市中国人民大学附属中学2023-2024学年高二下学期期中考试数学试题
名校
解题方法
7 . 等差数列的前n项和为
,若
,
,则( )
A.![]() | B.![]() |
C.![]() | D.![]() |
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2024-01-25更新
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7卷引用:陕西省西安市鄠邑区2023-2024学年高二上学期期末考试数学试题
8 . 已知等差数列
的前5项和
,且满足
,则等差数列
的公差为_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5032706dd285c22e149c675da465d9ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d6e6df674dbd7a19e7c7c5d9ba71472.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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解题方法
9 . 某网店统计了
商品近30天的日销售量,日销售量依次构成数列
,已知
,且
,则
商品近30天的总销量为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cceacfd0395da804e9fd4878fbd93080.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c0109d6a0159d7f8d5f156a3927266e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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2024-01-20更新
|
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