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1 . 某统计数据共有13个样本
,它们依次成公差
的等差数列,若第60百分位数为30,则它们的平均数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70f5fb222d30c17b68120423c53b7126.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d3b18d23d41e5f456dfd6485feed523.png)
A.19 | B.25 | C.21 | D.23 |
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2024-05-11更新
|
231次组卷
|
2卷引用:河北省邢台市第一中学2024届高三下学期二轮复习质量检测数学试题
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解题方法
2 . 在1和31之间插入14个数,使它们与1,31组成公差大于零的等差数列,则该数列的公差为( )
A.![]() | B.30 | C.-2 | D.2 |
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3 . 等差数列
中,
,则
的公差
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfdaea1fecbbb3b35f120f621a14e609.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c98c59cd4749afdd21e73529fc84323.png)
A.3 | B.2 | C.![]() | D.![]() |
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4 . 已知等差数列
的通项公式为
,则公差![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99a4658ab94306d39aedda17deed7216.png)
_______________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34c0e966db2d11c9dba1454ac6fcb8e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99a4658ab94306d39aedda17deed7216.png)
您最近一年使用:0次
5 . 在等差数列
中,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69b7d1b0e84b27de77f11bdb3096ea9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa37e5661af68b263a3ed9030d4e9003.png)
A.14 | B.15 | C.16 | D.18 |
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2024-04-26更新
|
951次组卷
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2卷引用:四川省成都市金牛区实外高级中学2023-2024学年高二下学期第一阶段考试数学试题
6 . 设等差数列
的前
项和为
若
,
,则
( )
![](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/1bf4000fec5bf94d56935108d72af3c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e2aca943dc3ed94ab930c1cf52c7352.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84f9997226581fcb41b2fe15bafb928a.png)
A.99 | B.101 | C.2500 | D.![]() |
您最近一年使用:0次
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7 . 设
为等差数列
的前
项和,已知
,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/c153267d0f63a741ab4c54f99f2b9a33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f65fc200f10b97588a0c9896277c9c64.png)
A.5 | B.7 | C.9 | D.10 |
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2024-04-24更新
|
983次组卷
|
3卷引用:云南省昆明市云南师范大学附属中学2023-2024学年高二下学期教学测评月考(五)数学试题
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8 . 设等差数列
的前
项和为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7999465d0e871febde66296a0cbf058c.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/0b389a8bea18b8a276a448b1b2f7342d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7999465d0e871febde66296a0cbf058c.png)
您最近一年使用:0次
2024-04-24更新
|
688次组卷
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3卷引用:陕西省安康市高新中学、安康中学高新分校2023-2024学年高三阶段性测试(八)理科数学试题
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9 . 在等差数列
中,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f95639ea0eef3c14bce022578f01f31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e4487468ab2823d6dbf7f0ebd2eb38.png)
A.4 | B.5 | C.6 | D.8 |
您最近一年使用:0次