1 . 已知集合
,数列
是公比为
的等比数列,且等比数列的前三项满足
.
(1)求通项公式
;
(2)若
是等比数列
的前
项和,记
,试用等比数列求和公式化简
(用含
的式子表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a2e319e92e7ed13517b289b540cdc10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbe40a8cfbaca945b40ff1c301830277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ff3683cb7b785c8fed2ccd4ceef9dbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22fca8b9c1b03fd45335db128b0cd5d8.png)
(1)求通项公式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d64620d2205231f5ca000a16998e8dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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2 . 已知
是等差数列
的前
项和,且
,
.
(1)求通项公式
;
(2)若
,求正整数
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63c6e0c2d16cda7e8b2b8c588adeb8ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a0eecb5b800fce9ae10aed86ffee62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fae11456bad734b71acbbc77888287e.png)
(1)求通项公式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8ec9fb36e69e5e50e73105d113a120b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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3 . 数列
满足:
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5259cde8f5725f744d511026ccb03a6.png)
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6247bae38a179cb9613d24f5affbb1b3.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63c6e0c2d16cda7e8b2b8c588adeb8ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc6545b8eca1c4223ed701a199a85683.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5259cde8f5725f744d511026ccb03a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bd048fe3fbd6b0623f146a0ef9021e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6247bae38a179cb9613d24f5affbb1b3.png)
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4 . 某海域中有一个小岛
(如图所示),其周围3.8海里内布满暗礁(3.8海里及以外无暗礁),一大型渔船从该海域的
处出发由西向东直线航行,在
处望见小岛
位于北偏东75°,渔船继续航行8海里到达
处,此时望见小岛
位于北偏东60°,若渔船不改变航向继续前进,试问渔船有没有触礁的危险?答:______ .(填写“有”、“无”、“无法判断”三者之一)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/eb02d665-2ea5-4eb5-b3e1-27432a8f512f.png?resizew=196)
您最近一年使用:0次
2019-12-11更新
|
210次组卷
|
3卷引用:上海市黄浦区2018-2019学年高一下学期期末数学试题
上海市黄浦区2018-2019学年高一下学期期末数学试题山东省德州市夏津第一中学2019-2020学年高三上学期12月月考数学试卷(已下线)6.3.3解三角形在实际生活中的应用(作业)-【上好课】2020-2021学年高一数学下册同步备课系列(沪教版2020必修第二册)
5 . 已知等比数列
中,
,
,则该等比数列的公比的值是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87888c666bdeb939587d80b3f38902c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a2a6940b1f686e36b23368306e19c5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a984437c5e416ba082d1d2f07dd6158.png)
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6 . 已知等差数列
中,
,
,则该等差数列的公差的值是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63c6e0c2d16cda7e8b2b8c588adeb8ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/562bf10d55724c77204c6953c7fbf7e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97e8b509e3fe1470ef8bb9c6d15605be.png)
您最近一年使用:0次
7 .
和2的等差中项的值是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bf3d3564c61e5e9c39a9e2cf2de048b.png)
您最近一年使用:0次
名校
8 . 等比数列
中,
为其前n项和,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.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/a3fb1f8f2f4ef1fd18aedc8edfec46a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
您最近一年使用:0次
2019-12-06更新
|
664次组卷
|
4卷引用:上海市黄浦区2019届高三二模数学试题
名校
9 . 在平面直角坐标系中,不等式组
所表示的平面区域的面积是________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e87b559c4db10b3648bd90d2a6b71cb.png)
您最近一年使用:0次
2019-12-03更新
|
220次组卷
|
3卷引用:上海市格致中学2018-2019学年高二下学期期中数学试题
名校
10 . 设数列
的各项都为正数且
,
内的点
均满足
和
的面积比为
,若
,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e976c0663fa749ca749f99842d21ca03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87a60302649eb940748da818199e55da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e507a75155c8701e737d61a4830a5bd1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78a2c31317098e295af73389899b66c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4f29ce901cddf517a843118f9e71472.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbe103f073845122c66f22dcb14b711f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f88ce6c8a57fcc8faab0a826eb8f8a30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee9b42973c53907f09f2de384c42fc5f.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2019-11-20更新
|
394次组卷
|
2卷引用:2019年上海市格致中学高三上学期第一次检测数学试题