题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050333-18573.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050333-82968.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050333-34291.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050333-47381.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050333-85712.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050333-25758.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050333-84539.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050334-40054.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050334-43827.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050333-85712.png)
(1)比较
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050334-60237.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050334-24047.png)
(2)设函数
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050334-38358.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050334-10739.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050334-96609.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050334-27367.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050335-58099.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050333-85712.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050334-96609.png)
(3)设数列
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050335-63471.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050335-73326.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050335-25418.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050335-74802.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050335-63003.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050335-61114.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050333-85712.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050335-92990.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050335-63471.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050335-68670.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050335-74196.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050335-63471.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050333-84539.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050336-36842.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050336-98173.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050336-67486.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050336-65057.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050336-57188.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050337-40564.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050337-73631.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050337-40157.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050337-64855.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050338-21012.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050338-25870.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050338-80614.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050338-95552.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050338-55924.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050339-24441.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050339-55789.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050339-69972.png)
(2)假设存在实数
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050339-52800.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050339-56529.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050335-58099.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050338-55924.png)
即
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050340-66581.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050338-55924.png)
由(1)知数列
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050334-10739.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050340-70167.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050340-14629.png)
解得
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050340-30053.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050341-43493.png)
所以存在最大的实数
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050341-30048.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050339-56529.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050335-58099.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050338-55924.png)
(3)由
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050341-94856.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050341-96496.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050341-81162.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050342-87846.png)
① 若
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050342-65167.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050342-55358.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050342-24688.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050343-63340.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050335-63471.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050343-22845.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050343-79746.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050343-20529.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050343-53410.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050344-53377.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050344-50687.png)
此时,
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050335-63471.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050344-18265.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050344-18265.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050344-64390.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050344-18265.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050344-18265.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050344-64390.png)
② 若
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050345-66557.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050345-88880.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050345-59943.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050335-63471.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050343-22845.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050345-22482.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050345-13321.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050346-15732.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050346-82455.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050346-56121.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050344-50687.png)
设数列
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050335-63471.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050336-65057.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050336-57188.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050338-55924.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050346-62262.png)
即
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050347-49036.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050347-26289.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050347-66891.png)
解析
核心考点
试题【(本题满分16分)定义,,…,的“倒平均数”为().已知数列前项的“倒平均数”为,记().(1)比较与的大小;(2)设函数,对(1)中的数列,是否存在实数,使得】;主要考察你对数列综合等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050318-36909.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050319-52219.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050319-63640.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050319-26127.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050319-40696.png)
(Ⅰ)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050318-36909.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050319-45694.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050320-63749.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050319-52219.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050320-50855.png)
数列
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050256-66811.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050256-45330.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050257-24372.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050257-11361.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050257-98121.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050257-82678.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050257-18604.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050258-77684.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050258-68437.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050258-43995.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050258-37313.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050259-68970.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050259-33014.png)
(Ⅰ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050259-85541.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050259-90553.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050259-35659.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050300-38360.png)
(Ⅱ)在数列
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050256-45330.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050300-95982.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050300-48823.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050300-10819.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050301-75765.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050301-51526.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050301-46707.png)
(Ⅲ)在(Ⅰ)的条件下,设数列
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050301-25484.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050302-82664.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050302-47567.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050302-98482.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050302-36056.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050303-54217.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050303-96815.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050303-42431.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050249-31758.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050250-47200.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050250-46239.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050250-97092.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050250-39441.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050251-74187.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050250-46239.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050235-23143.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050235-60073.png)
A.第6项 | B.第7项 | C.第8项 | D.第9项 |
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050218-58040.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050219-48998.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050219-18440.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050219-40310.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050219-98492.png)
A.![]() | B.![]() | C.![]() | D.![]() |
最新试题
- 1【题文】君主专制从秦到清有不断强化的趋势,w*w^w.k&s#5@u.c~o*m下列选项能反映这一发展趋势的是①
- 2如图,半径为2的半圆O中有两条相等的弦AC与BD相交于点P.(1)求证:PO⊥AB;(2)若BC=1,则PO的长是 __
- 3图甲(a)是一个能够显示平抛运动及其特点的演示实验,用小锤敲击弹性金属片,小球A就沿水平方向飞出,做平抛运动;同时小球B
- 4下图中①②③④表示气压带,⑤⑥⑦表示风带。读图完成下列问题。小题1:有关图中气压带和风带的判断,正确的是( ) A.①
- 5阅读下面的材料:∵ax2+bx+c=0(a≠0)的根为x1=-b+b2-4ac2a,x2=-b-b2-4ac2a∴x1+
- 6一列横波在x轴上传播,如图所示的实线和虚线为这列波在t1 = 0s和t2 =0.075s时的波形。(1)若波速为400
- 7(1)黄铁矿(FeS2)是制造硫酸的矿物原料,反应历程为FeS2→SO2→SO3→H2SO4,请写出SO2制备SO3反应
- 8下列各句中,没有语病的一项是[ ]A.江海区挂牌成立的困难归侨侨眷救助站,将以保障归侨侨眷生活为目标,除了以各项
- 9阅读下面寓言,写一篇作文。 妈妈要出门,临走前叮嘱三岁的双胞胎孩子在卧室里玩游戏。由于窗户关着,阳光进不来,兄弟俩就商
- 10如图是一个切去了一个角的正方体纸盒,切面与棱的交点A,B,C均是棱的中点,现将纸盒剪开展成平面,则展开图不可能是( )
热门考点
- 1总长度1318公里、总投资约2209亿元的京沪高速铁路于2010年11月15日铺轨完成,预计2012年之前建成通车。该工
- 2下列说法正确的是( )A.两个全等图形一定可以看作其中一个是另一个平移得到的B.边长相等的两个等边三角形一定是由平移得
- 3悬空固定一个长l1=0.30m无底圆筒CD.现将一根长l2=0.24m的直杆AB在A端距圆筒CD底部H=5.46m处,从
- 4已知数列{an}的通项公式是an=2+200-30nn2,则数列{an}中最小项的项数是第______项.
- 5世界上第一枚原子弹爆炸时,恩里克·费米把事先准备好的碎纸片从头顶上撒下,碎纸片落到他身后约 2m 处,由此,他根据估算出
- 6设集合,则A. B. C. D.
- 7阅读下列材料: 材料一 季康子问政于孔子曰:“如***无道,以就有道,何如?”孔子对曰:“子为政,焉用***?子欲善,而民善也。
- 8如果没有禁烟运动就不会爆发鸦片战争。
- 9在函数y=x+1x中,自变量x的取值范围是( )A.x≠-1B.x≠0C.x≥-1D.x≥-1,且x≠0
- 10如图是一个小麦新品种的培育过程.引起小麦这种变异的根本原因是( )A.改变了小麦体内的营养成分B.改变了小麦体内