满分5 >
高中数学试题 >
下列说法中: ①函数y=lg(x2-ax-a)的值域为R,则a∈(-4,0); ...
下列说法中:
①函数y=lg(x
2-ax-a)的值域为R,则a∈(-4,0);
②O是△ABC所在平面上一定点,动点P满足
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101017105808140/SYS201311031010171058081015_ST/0.png)
且λ∈[0,+∞),则P的轨迹一定经过△ABC的内心;
③要得到函数y=f(1-x)的图象只需将y=f(-x)的图象向左平移1个单位;
④若函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101017105808140/SYS201311031010171058081015_ST/1.png)
,则“m+n≥0”是“f(m)+f(n)≥0”的充要条件.
其中正确的序号是
.
考点分析:
相关试题推荐
如图,OM∥AB,点P在由射线OM,线段OB及AB的延长线围成的区域内(不含边界)运动,且
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101017105808140/SYS201311031010171058081014_ST/0.png)
,则x的取值范围是
;当
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101017105808140/SYS201311031010171058081014_ST/1.png)
时,y的取值范围是
.
查看答案
2009年北京国庆阅兵式上举行升旗仪式,在坡度为15°的观礼台上,某一列座位与旗杆在同一个垂直于地面的平面上,在该列的第一排和最后一排测得旗杆顶端的仰角分别为60°和30°,且第一排和最后一排的距离为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101017105808140/SYS201311031010171058081013_ST/0.png)
米,则旗杆的高度为
米.
查看答案
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101017105808140/SYS201311031010171058081012_ST/images0.png)
如图,在△ABC中,AD⊥AB,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101017105808140/SYS201311031010171058081012_ST/0.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101017105808140/SYS201311031010171058081012_ST/1.png)
,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101017105808140/SYS201311031010171058081012_ST/2.png)
=
.
查看答案
已知f(x)为R上的可导函数,且对∀x∈R,均有f(x)>f′(x),则有( )
A.e
2013f(-2013)<f(0),f(2013)<e
2013f(0)
B.e
2013f(-2013)<f(0),f(2013)>e
2013f(0)
C.e
2013f(-2013)>f(0),f(2013)<e
2013f(0)
D.e
2013f(-2013)>f(0),f(2013)>e
2013f(0)
查看答案
已知函数f(x)满足:当x≥4时,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101017105808140/SYS201311031010171058081010_ST/0.png)
,当时,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101017105808140/SYS201311031010171058081010_ST/1.png)
,则f(-2009+log
23)=( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101017105808140/SYS201311031010171058081010_ST/2.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101017105808140/SYS201311031010171058081010_ST/3.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101017105808140/SYS201311031010171058081010_ST/4.png)
D.
查看答案