题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204110442-22047.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204110443-25244.png)
A.没有零点 | B.有且仅有一个零点 |
C.有且仅有两个零点 | D.有无穷多个零点 |
答案
解析
(方法一)数形结合法,令
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204110442-22047.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204110443-55058.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204110443-63753.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204110443-50759.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204110444-89957.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204110443-25244.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204110442-22047.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204110443-25244.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204110444-26209.jpg)
(方法二)在
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204110444-70056.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204110444-95110.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204110445-18093.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204110442-22047.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204110445-16451.png)
在
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204110445-22180.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204110446-58173.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204110442-22047.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204110446-77219.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204110446-39395.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204110442-22047.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204110446-48162.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204110413-92035.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204110414-68457.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204110414-33793.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204110414-87377.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204110413-92035.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204110415-48077.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204110415-48077.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204110413-92035.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204110415-29276.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204110415-81693.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204110415-43120.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204110416-59663.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204110416-51860.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204110416-29578.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204110416-42563.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204110417-66627.jpg)
(1)试求
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204110417-86246.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204110417-36730.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204110417-49755.png)
(2)求
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204110418-64564.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204110406-78258.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204110407-24615.png)
A.2 | B.4 | C.6 | D.8 |
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204110400-24328.png)
A.1+25ln5 | B.8+25ln![]() | C.4+25ln5 | D.4+50ln2 |
(1)求函数f(x)=(1+x)r+1﹣(r+1)x﹣1(x>﹣1)的最小值;
(2)证明:
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204110346-83837.png)
(3)设x∈R,记[x]为不小于x的最小整数,例如
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204110347-81137.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204110347-89482.png)
(参考数据:
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204110347-73275.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204110327-74736.png)
最新试题
- 1--When did the World Exposition(世博会) in Shanghai begin? --Th
- 2在做“匀变速直线运动的研究”的实验时,某同学得到一条用打点计时器打下的纸带,并在其上取了A、B、C、D、E、F等6个计数
- 3如果两个不等式的解集相同,那么这两个不等式叫做同解不等式.下列两个不等式是同解不等式的是( )A.4x<48与x>12
- 4澳大利亚有一种外形奇特、美丽的琴鸟,它们都在冬季繁殖,这样可以避免蛇类等前来偷食它们的卵和雏鸟,按照达尔文的理论,这是(
- 5自然地理环境各要素通过水循环、大气循环、生物循环和岩石圈物质循环等过程,进行着物质迁移和能量交换,形成了一个相互渗透、相
- 6下列常用词语中字音有错误的一组是A.村妪yù昏聩kuì泥淖nào 畋猎tián缜密zhěnB.皴裂cūn混淆xiáo奴婢
- 7氰(CN)2和硫氰(SCN)2的化学性质和卤素很相似,化学上称为“拟卤素”。它们的阴离子还原性强弱为:Cl-<Br
- 8读“近现代全球平均气温距平均变化”图,回答(1)气温变化特点是大致呈
- 9如图S是发光点,S′是经凸透镜所成的虚像.(1)画出入射光线SA的折射光线的位置.(2)作图确定此透镜的焦点.
- 10质量大的实心物体,一定比质量小的实心物体的密度大。[ ]
热门考点
- 1下图为我国沿某纬线主要外力作用过程示意图。读图回答1—3题。1、图中①②③④各区域的主要外力作用依次是[ ]A.
- 2目前,财政部将证券交易印花税税率由原来的1‰(千分之一)提高到3‰,如果税率提高后的某一天的交易额为a亿元,则该天的证券
- 3造成下图所示的公私经济成分比例状况的主要原因是[ ]A.三大改造 B.大跃进和人民公社化运动 C.家庭联产承包责
- 4We have no idea at all __________.A.where he has goneB.where
- 5如图:已知正方形的边长为a,三角形的高为h,此正方形剪去四个相同的三角形.(1)画出该图形的基本图案;(2)用代数式表示
- 6若ax=2,ay=3,则a3x-y=______.
- 7-Will there be school in the future?-______. I think that st
- 8如图所示,标有1、2、3号码的三个物体,质量和体积都相同,均放在水平地面上.则它们对地面产生的压强A.1号最大B.2号最
- 9在九张质地都相同的卡片上分别写有数字-4,-3,-2,-1,0,1,2,3,4,从中任意抽取一张卡片,则所抽卡片上数字的
- 10阅读下面的语段,按要求完成1—2小题。 语段1:高利贷者夏洛克是个不懂得怜悯( )的恶汉。他为了复仇,