名校
解题方法
1 . 已知数列
满足
,且
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e2956b1eacaabaf91dfe664c4ea7940.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e976c0663fa749ca749f99842d21ca03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5562171cdbc0ac18cb95e1c94fa07c0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb2dd78aa7ac3df9b83c075bb13f415d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/464d5fe51a7dc6bef2b4b4ff5341dc79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e2956b1eacaabaf91dfe664c4ea7940.png)
您最近一年使用:0次
名校
2 . 已知数列
为等比数列,若
,且
与
的等差中项为
,则
的值为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ec66faf5ace112f012aa331efa5c82f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf464629fa321a6ff7401ab79f07083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c39835887158fcba559fdfe35ebb5c63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d59ab85c075a09d55d69e159e4abb268.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35efd7684afa9ab0bddd26b586af73d0.png)
您最近一年使用:0次
名校
3 . 已知等差数列
的公差为d,随机变量
满足
,
,则d的取值范围为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce31f84a0f2e6a750e4ef90fe11bae8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79059a3366ed1b339ba1317ce8a1e7f9.png)
您最近一年使用:0次
名校
4 . 在等差数列
中,已知
,那么![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbfc875ca919921e8f63a6fca648561b.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5a6876ab5414929ad3f1bbcdb2000db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbfc875ca919921e8f63a6fca648561b.png)
您最近一年使用:0次
2023-04-23更新
|
357次组卷
|
2卷引用:山东省日照市2022-2023学年高二下学期期中校际联合考试数学试题
5 . 已知m是
与4的等差中项,且
,则
的值为____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8c05dbfd81b5c45c5df54ee7481b6ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d322a1abc1caf9e60d7ea180ceb21c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
您最近一年使用:0次
2023-04-13更新
|
687次组卷
|
4卷引用:河北省石家庄市元氏县音体美学校2022-2023学年高二下学期第二次月考数学试题
6 . 在等差数列{an}中,已知
为方程
的两根,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dbd9ff686703cad03aa383e5fec21.png)
____
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3480c1588d7838fbc46aea96694fc76e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93d889a5593d971f0f6f3af5be707afa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dbd9ff686703cad03aa383e5fec21.png)
您最近一年使用:0次
名校
7 . 已知等差数列
的前
项和为
,若
,
,则
等于______ .
![](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/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb2c8dedfa4e56af166f7a3f6bd91ad2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2092f7f045371254f7d3a1e9a4d5befb.png)
您最近一年使用:0次
名校
8 . 等差数列
中,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e4487468ab2823d6dbf7f0ebd2eb38.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cec403a31e8c0881c8d2baa9de8ab44e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e4487468ab2823d6dbf7f0ebd2eb38.png)
您最近一年使用:0次
名校
9 . 某高中共有1200人,其中高一、高二、高三年级的人数依次成等差数列,现用分层抽样的方法从中抽取30人,那么高二年级被抽取的人数为
您最近一年使用:0次
名校
10 . 设等差数列
的前
项和为
,若
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbfc875ca919921e8f63a6fca648561b.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/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd478b1ba0e42545b45d505e2e84a140.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbfc875ca919921e8f63a6fca648561b.png)
您最近一年使用:0次