题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010939-47568.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010940-30844.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010941-82155.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010941-70004.png)
A.![]() | B.![]() | C.-5 | D.5 |
答案
解析
试题分析:
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010942-27780.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010941-82155.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010942-29705.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010941-70004.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010942-67748.png)
点评:判定一个数列是等比数列主要还是利用等比数列的定义,而通项公式的灵活运用是简单求解此题的关键.
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010615-20322.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010615-64989.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010615-27342.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010615-62463.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010615-27556.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010550-46940.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010550-99521.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010550-97742.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010550-84335.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010551-66207.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010550-46940.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010550-97742.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010551-68354.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010551-64215.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010551-33888.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010552-36153.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010534-76832.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010535-92981.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010535-83686.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010535-66742.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010535-24332.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010536-25803.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010527-53137.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010527-10436.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010528-56644.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010528-28814.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010528-26566.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010528-25770.png)
A.![]() | B.![]() | C.![]() | D.![]() |
已知数列
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010514-16335.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010514-93867.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010514-67798.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010515-62993.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010515-50559.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010515-50700.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010515-14529.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010515-28310.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010516-23094.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010516-76489.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010515-62993.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010516-78040.png)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010516-51282.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010516-78040.png)
(Ⅱ)是否存在正整数
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010517-29491.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010517-96078.png)
最新试题
- 1观察下图,这是《天工开物》中描绘时代矿工在井下采煤情景的插图。图中有一根中间打通的长竹竿,从地面上插进矿井深处。这根长竹
- 2动脉血和静脉血的区分标准是( )A.氧气含量的高低B.营养物质的多少C.在动脉中流动还是在静脉中流动D.没有任何区别
- 3椭圆的离心率e=22,以椭圆长轴、短轴、焦距的长为边长组成三角形为( )A.钝角三角形B.锐角三角形C.等腰直角三角形
- 4如图,AP∥BC,∠PAB的平分线与∠CBA的平分线相交于E,CE的延长线交AP于D.(1)求证:AB=AD+BC;(2
- 5“秦孝公用商鞅,坏井田,开阡陌,急耕战之赏,犹以务本之故,倾邻国而雄诸侯。然王制遂灭,僭差亡度、庶人之富者累百巨万,而贫
- 6党的十八大提出到2020年全面建成小康社会,国内生产总值和人均收入比2010年翻一番,人民生活水平将会有更大的提高。这必
- 7摄影记者解海龙深入安徽采访希望工程,在众多的女孩子中发现一双闪亮的眼睛“大眼睛”,拍下了《我要读书》照片,推出了全国希望
- 8欧洲西部地区受海洋的影响( ) A.使降水减少B.使温差增大C.使气温升高D.使温差减小
- 9用斜线(/)给下面的文言文断句(5分)邯郸之民以正月之旦献鸠于简子,简子大悦,厚赏之。客问其故简子曰正旦放生示有恩也客曰
- 10在历届全国人民代表大会的代表中,少数民族代表所占名额的比例,都高于同期在全国人口中所占的比例。在全国政治协商会议中,每个
热门考点
- 1(a+3b)2(a-3b)2.
- 2少量饮酒对身体并没有危害,可以舒筋活血、御寒壮骨。[ ]
- 3直线y=1-x交抛物线y2=2px(p>0)于M,N两点,向量OM+ON与弦MN交于点E,若E点的横坐标为32,则p的值
- 4用于制造隐形飞机的某种物质具有吸收微波的功能,其主要成分的结构简式如图,它属于A.烯烃 B.烷烃C.烃 D.有机化合物
- 5It"s very nice ________ you to help me. [ ]A. of B. for
- 6设全集,集合,,则 ( )A.B.C.D.
- 7------How do you find James Cameron"s 3D version of Titanic?
- 8出租车起步价8元,3km后每千米另加1.2元,小明乘坐出租车行驶x(x>3)km,则需要付______元.
- 9阅读下列材料:材料一 我们美国正在打一场伟大而成功的战争。这不仅是一种反对匮乏、贫穷与经济不景气的战争,而且是一种争取民
- 10根据课文内容回答问题。①人会经历许多第一次,《第一次真好》中说第一次越多,生命也就愈多姿多彩。可有的同学说:第一次太多未