题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094350-12449.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094350-32595.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094350-45001.png)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094350-22104.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094351-20562.png)
(2)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094350-12449.png)
(3)若
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094351-77975.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094351-49872.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094351-72368.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094352-58701.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094352-99122.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094352-83272.png)
解析
(1)由题意得
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094352-99123.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094352-47877.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094353-56103.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094353-69459.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094353-69459.png)
(2)因为
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094353-21948.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094353-15499.png)
(3)因为
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094354-19569.png)
,那么利用错位相减法可知和式。
解:(1)由题意得
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094352-99123.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094352-47877.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094353-56103.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094353-69459.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094353-69459.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094353-21948.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094353-15499.png)
(3)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094354-19569.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094354-23148.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094354-41150.png)
①-②得
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094354-99130.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094355-43849.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094326-78556.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094326-83821.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094326-81581.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094326-74783.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094313-20924.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094313-93982.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094313-61320.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094313-73702.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094313-23040.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094314-63644.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094314-13632.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094313-23040.png)
(2)求数列{
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094314-38098.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094313-93982.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094314-64712.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094301-34331.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094301-81173.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094301-76621.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094302-47171.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094302-70869.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094302-72101.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094248-85911.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094248-86030.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094249-55726.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094249-60563.png)
(1) 证明数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094249-77051.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094248-86030.png)
(2) 设数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094249-82131.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094250-61130.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094249-82131.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094250-57459.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094233-23232.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094234-50189.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094234-76849.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094234-32660.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012094234-67987.png)
最新试题
- 1小马虎在下面的计算中只做对了一道题,他做对的题目是[ ]A.(a﹣b)2=a2﹣b2B.(﹣2a3)2=4a6C
- 2根据右面消化系统模式图,分析回答下列问题:(1)图中标号①、④、⑥所示器官属于消化系统的______.(2)分泌的消化液
- 3下列各数中,互为倒数的是( )A.-3和3B.-512和211C.0.75和-43D.-1和-1
- 4短文填词 Sometimes people were traveling to look for rich
- 5按照物质的树状分类和交叉分类,HNO3应属于 ( )①酸;②氧化物;③含氧酸;④一元酸;⑤电解质;⑥混合物;⑦无机
- 6一根长60厘米的弹簧,一端固定.如果另一端挂上物体,那么在正常情况下物体的质量每增加1千克可使弹簧增长1.5厘米.(1)
- 7在极坐标系中,过点(1,0)并且与极轴垂直的直线方程是[ ]A、ρ=cosθB、ρ=sinθ C、ρcosθ=1
- 8Don’t ___a story. What I want to know is the whole truth abo
- 9There was a pilot and four people in a small plane. Suddenly
- 10给出四个命题:①各侧面都是正方形的棱柱一定是正棱柱;②各对角面是全等矩形的平行六面体一定是长方体;③有两个侧面垂直于底面
热门考点
- 12003年12月23日,重庆开县发生高压井喷事故,喷出的气体中含有臭鸡蛋气味的有毒气体,该有毒气体可能是( )A.H2
- 2下列说法中正确的是 ______(1)事件A、B至少有一个发生的概率一定比A、B中恰有一个发生的概率大;(2)事件A、B
- 3下列有关ATP的叙述,正确的是①在肺泡表面进行气***换需要消耗ATP ②若细胞内Na+浓度偏高,为维持Na+浓度的稳定,
- 4将下面五个选择项分别填在横线上,每项只能用一次:A .缓慢氧化 B .疏松多孔 C .受空气和水共同作用D .
- 5a、b是水平绳上的两点,相距105厘米,一列正弦波沿绳传播,方向从a到b,每当a点经过平衡位置向上运动时,b点正好到达上
- 6(能力拔高题)春秋战国的争霸.东汉末年军阀割据,唐朝中后期的藩镇割据,五代十国等现象出现根源于( ) A.封建自然经
- 7有理a、b、c在数轴上位置如图所示,化简|a+b|+|b+c|﹣|b﹣a|=( ).
- 8现有三组实验:①除去混在植物油中的水;②回收碘的CCl4溶液中的CCl4;③用食用酒精浸泡中草药提取其中的有效成分。分离
- 9单项选择。I"m new here, so I have friends. [ ]A.
- 10(2009年6月福建会考6题)如果我们上网搜索以下三幅图的历史信息,应键入的“关键词”是 A.国民革命 B.红