1 . 在中国农历中,一年有24个节气,北京2022年冬奥会开幕式上“二十四节气”的倒计时让全世界领略了中华智慧.从冬至日起,依次有小寒、大寒、立春、雨水、惊蛰、春分、清明、谷雨、立夏、小满、芒种,这些节气的日影长依次成等差数列,小寒、雨水、清明日影长之和为31.5尺,则前九个节气日影长之和为( )
A.94.5尺 | B.93.5尺 | C.92.5尺 | D.91.5尺 |
您最近一年使用:0次
2 . 已知数列
为等差数列,数列
为公比大于0的等比数列,且
,
,
.
(1)求数列
和
的通项公式;
(2)设
,求数列
的前12项和
.
![](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/ebaf2a2590bb84d646957f913d78f6dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dc33a3eff8245180017c027e63fb132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f68cb11994d868f27f02e7ef1c1d7bdd.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3aeb9590892084cf255be386d3b0b60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/711161d23bed5161de370857a687c3ea.png)
您最近一年使用:0次
3 . 已知
是公差为2的等差数列,其前10项和为100;
是公比大于0的等比数列,
,
.
(1)求
和
的通项公式;
(2)记
,
,
,
.
①证明数列
是等比数列:
②证明
.
![](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/5b72ddd7de598464a37b10f03f67b904.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b6901c81ce168be95c63c6a6be7995c.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dabfc022622c58033ea5a6d7ab99227d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e145b6046bc80d0ffecc61ac67c87ca1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f4432eb7f0f9733bdd9065fa6c9e6ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e145b6046bc80d0ffecc61ac67c87ca1.png)
①证明数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b783cf91e34e692ce8e171f0965cb53f.png)
②证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/574b17c4cc9e262ff3206ee3130dbda7.png)
您最近一年使用:0次
4 . 设
是首项为1的等比数列,且满足
成等差数列,等差数列
前
项和为
,公差为1,且满足
.
(1)求数列
和
的通项公式;
(2)求数列
的前
项的和
;
(3)设
,求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34c6ce0c2bde32fb0bb69307830b57e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.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/cc87b0223fb15e20ffa231bfbdd90260.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4caddcd87f343356c7aca741ccc4207d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d51f9147b8265c0276c1f2c2659197.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbd85b79372dc6e596d465f738c3c300.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42aa958b64724411883d2c914a2fd2f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d51f9147b8265c0276c1f2c2659197.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d877218ebc51c7dd4db948c71363a02.png)
您最近一年使用:0次
5 . 在公差不为0的等差数列
中,
,且
,
,
成等比数列.
(1)求
的通项公式和前n项和
;
(2)设
,求数列
的前n项和公式
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7da6e97248df8f138ebe684c40c950c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5da4cd81500bdb43118150dbdb1541e6.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/216876de04325fd250c38c485cbc34b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
您最近一年使用:0次
2023-05-11更新
|
1636次组卷
|
7卷引用:天津市西青区为明学校2023-2024学年高三上学期开学测数学试题
6 . 若等差数列
的前n项和为
,数列
是等比数列,并且
,
.
(1)求数列
和
的通项公式;
(2)求数列
的前n项和
;
(3)若
,求数列
的前n项和
![](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/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/989131e2f71b5b24072d8897ec4e79c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dd69c5f1147579aa22be48a949ef7bd.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2767882820f4ba0defde0e412adb747f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0043c61573370bf80f39a0f2cc3b7dde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ddad3d9fdb5e9951b6a1c31f9a72a71.png)
您最近一年使用:0次
2023-02-21更新
|
1342次组卷
|
3卷引用:天津市西青区杨柳青第一中学2022-2023学年高二上学期期末数学试题
名校
解题方法
7 . 已知数列
的前n项和为
,设
,
,
,则
=___________ .
![](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/1a400b5443af7580aa8f0fb7499fe362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1bae03ee4ac75dacfb026290e4207dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75b3a1d8b1787a2d6a89b47696bb63bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
您最近一年使用:0次
2023-02-21更新
|
622次组卷
|
2卷引用:天津市西青区杨柳青第一中学2022-2023学年高二上学期期末数学试题
8 . 若直线
与圆C:
相切,则①
;②数列
为等差数列;③圆C可能经过坐标原点;④数列
的前10项和为23.以上结论正确的个数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46688ba0adc6c6a4c85f0d0c3161c8b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d75ea6a6ed66ed7a194b303f55007717.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04de5dcd476fd4059ab7b21775265741.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
A.1 | B.2 | C.3 | D.4 |
您最近一年使用:0次
解题方法
9 . 数列
的前n项和为
,
,数列
的前n项和为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.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/b3d4fe74f5287a2e23d9e8912714f1cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/362832fa3d3c13c1eafd565349d66dce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
您最近一年使用:0次
名校
10 . 已知等差数列中,
,则
( )
A.4 | B.5 | C.6 | D.7 |
您最近一年使用:0次
2023-08-02更新
|
1073次组卷
|
6卷引用:天津市西青区为明学校2023-2024学年高三上学期开学测数学试题