题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015122546-45850.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015122546-49276.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015122546-56565.png)
(1)若当
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015122546-10061.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015122546-40178.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015122547-87107.png)
(2)若当
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015122547-62062.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015122547-80256.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015122547-87107.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015122548-25732.png)
解析
试题分析:本题考查绝对值不等式的解法、恒成立问题、不等式的性质等基础知识,考查学生运用函数零点分类讨论的解题思想和转化思想.第一问,先解绝对值不等式
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015122546-10061.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015122546-40178.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015122548-62667.png)
试题解析:(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015122546-10061.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015122548-13113.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015122549-68243.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015122548-13113.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015122549-66666.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015122548-13113.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015122549-27438.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015122546-40178.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015122548-13113.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015122549-14890.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015122548-13113.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015122550-63418.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015122548-13113.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015122550-96316.png)
依题意有,
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015122550-44686.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015122550-13573.png)
故
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015122547-87107.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015122551-59885.png)
当且仅当
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015122551-42779.png)
解不等式
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015122551-60216.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015122547-87107.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015122548-25732.png)
核心考点
举一反三
A.ad=bc | B.ad<bc |
C.ad>bc | D.ad≤bc |
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015122451-55520.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015122452-81842.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015122431-93053.png)
(1)当a=1时,解不等式f(x)<2;
(2)若关于x的不等式f(x)≤5-|a+l|恒成立,求实数a的取值范围.
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015122415-95225.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015122415-37691.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015122415-75271.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015122415-18940.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015122335-24789.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015122335-17775.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015122336-52834.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015122336-33816.png)
最新试题
- 1– Aren’t you tired, Jane?– ________ I like going shopping.A.
- 24的平方根是( ),算术平方根是( )
- 3如图所示,体重为510N的人,用滑轮组拉重500N的物体A沿水平方向以0.02m/s的速度匀速运动.运动中物体A受到地面
- 4探究蚂蚁的觅食及搬食行为后,发现蚂蚁的内部语言是( )。A.声音B.动作C.气味D.光线
- 5(10天津市8).下列实验操作中,不正确的是
- 6He is said to have studied in America for three years, so
- 7在中,内角A,B,C的对边分别是,若,,则( )A.B.C.D.
- 8求的最小值。
- 9任务型阅读(共10小题;每小题1分,满分10分)请认真阅读下列短文,并根据所读内容在文章后表格中的空格里填入一个最恰当的
- 10(2011湖南益阳,14,6分)计算:.
热门考点
- 1一坡面的坡角为60°,则坡度i=______.
- 2父母,赋予我们生命,哺育我们成长,理应受到我们的孝敬和尊重。可在日常生活中,不时有以下情景或观念闪现:情景一:七年级学生
- 32008年5月12日14时28分,四川省汶川县发生里氏8.0级地震,造成巨大的人员伤亡和财产损失。在举国抗震救灾的同时,
- 4How can you expect to learn anything you never listen
- 5地图按内容分,可分为普通地图和________地图。
- 6函数y=的自变量x的取值范围是( ).
- 7室温下,下列各组离子在指定溶液中能大量共存的是( )A.饱和氯水中 Cl-
- 8It is the ability to do the job, not where you came from or
- 9小记者:进入青春期后,我们发生了一系列明显的生理变化。面对这些变化,有些同学产生了过分激动、羞涩、烦躁、恐慌等心理反应,
- 10满足线性约束条件的目标函数z=x+y的最大值是[ ]A.1 B. C.2