1 . 已知数列
与
,若
且对任意整数
满足
,数列
的前
项和
.
(1)求数列
的通项公式;
(2)求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b7e7cd571c8cd141cbbfe5d0890bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b13a6e1d671215fc96e4bee3541d1096.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cdcd8d05ef17d7d03551b1621614c31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b7e7cd571c8cd141cbbfe5d0890bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/636aae0f9abe37980e10e9922da2d915.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6dcba920904a03e3f950e962cc8c7ad.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fc5b76208b0e4655a7b5470f72b413f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
您最近一年使用:0次
2016-05-10更新
|
1080次组卷
|
2卷引用:2016届青海省平安一中高三4月月考文科数学试卷
解题方法
2 . 若实数
满足约束条件
,则
的最大值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0fffbec1fe851795dfdd448bf0d165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ec7c0a7aeaff35f755619cda7bcd7f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febaeb957daf54c835287a936f414551.png)
A.![]() | B.6 | C.13 | D.15 |
您最近一年使用:0次
名校
3 . 公差不为零的等差数列{an}中,a3=7,且a2,a4,a9成等比数列.
(1)求数列{an}的通项公式;
(2)设bn= ,求数列{bn}的前n项和Sn.
您最近一年使用:0次
2017-07-12更新
|
587次组卷
|
2卷引用:青海省西宁市第四高级中学2016-2017学年高一下学期第二次月考数学试题
名校
解题方法
4 . 在
中,角
所对的边分别为
.已知
,
,
.
(1)求b的值;
(2)求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce7af7c5df749c6fa9bbe87faa72c66d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88f2599ca8b6b683e57a82699c8b1ebb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3711c8ba16405959bcb0b70385da1d89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ae7888d643678ea18f83f3237732052.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c80ef3dc7add1229f46ca757f536a240.png)
(1)求b的值;
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eae49e7e369c7ff604aea2243c53b21.png)
您最近一年使用:0次
2017-06-29更新
|
539次组卷
|
2卷引用:青海省西宁市城西区青海湟川中学2022-2023学年高三上学期12月月考理科数学B试题
5 . 若
,
,
与
的等差中项是5,则
的最大值是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ca5fd57c2c2fcc3c7a574fdd1467d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18f0281e6bbdbe08beeccb55adf84536.png)
您最近一年使用:0次
6 . 2,x,y,z,18成等比数列,则x=________ .
您最近一年使用:0次
7 . 设数列
的前
项和为
,且满足![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dbbbbd7005d91fe5d18afba668837ab.png)
.
(1)求
;
(2)数列
的通项公式;
(3)设
,求证:
.
![](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/0dbbbbd7005d91fe5d18afba668837ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92b5124c1981cc2b7c4850613d6d3b5d.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
(2)数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb72b465181887a8d5f22b1f7e4c421f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/733c393eb55f776b8383277cc946e200.png)
您最近一年使用:0次
8 . 不等式
表示的区域在直线
的( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a032d2007610324703c0a6732d508399.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0985b973395bcd371cd1e26d3fcd1c36.png)
A.右上方 | B.右下方 | C.左上方 | D.左下方 |
您最近一年使用:0次
名校
9 . 某工厂建造一间地面面积为12
的背面靠墙的矩形小房,房屋正面的造价为1200元
,房屋侧面的造价为800元
,屋顶的造价为5800元.若墙高为3
,且不计房屋背面的费用,则建造此小房的最低总造价是多少元?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8d7b4bb12628d5ed455d814b8aafa1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6f27bf8d057e7d1982734804129feef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6f27bf8d057e7d1982734804129feef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次
2017-07-12更新
|
558次组卷
|
2卷引用:青海省西宁市第四高级中学2016-2017学年高一下学期第二次月考数学试题
10 . 设等差数列
的前
项和为
,
,则![](https://img.xkw.com/dksih/QBM/2016/5/10/1572629506252800/1572629511380992/STEM/7c328e2fc3654fac9ec9bb188c3855de.png)
![](https://img.xkw.com/dksih/QBM/2016/5/10/1572629506252800/1572629511380992/STEM/87d66ce139684f02915bd0a4eb0f3639.png)
![](https://img.xkw.com/dksih/QBM/2016/5/10/1572629506252800/1572629511380992/STEM/07599be97e5d48cdb4f5a5b855cc01fe.png)
![](https://img.xkw.com/dksih/QBM/2016/5/10/1572629506252800/1572629511380992/STEM/614b42d8ae4c4d33985e34fb1e25f598.png)
![](https://img.xkw.com/dksih/QBM/2016/5/10/1572629506252800/1572629511380992/STEM/a7d94f8d45af439d952f1e07fcc89cd8.png)
![](https://img.xkw.com/dksih/QBM/2016/5/10/1572629506252800/1572629511380992/STEM/7c328e2fc3654fac9ec9bb188c3855de.png)
A.3 | B.4 | C.5 | D.6 |
您最近一年使用:0次