满分5 >
高中数学试题 >
若f′(x)=2,则等于( ) A.-1 B.-2 C.1 D.
若f′(x
)=2,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100716253583625/SYS201311031007162535836004_ST/0.png)
等于( )
A.-1
B.-2
C.1
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100716253583625/SYS201311031007162535836004_ST/1.png)
考点分析:
相关试题推荐
已知点F
1(-4,0)和F
2(4,0),曲线上的动点P到F
1、F
2的距离之差为6,则曲线方程为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100716253583625/SYS201311031007162535836003_ST/0.png)
-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100716253583625/SYS201311031007162535836003_ST/1.png)
=1
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100716253583625/SYS201311031007162535836003_ST/2.png)
-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100716253583625/SYS201311031007162535836003_ST/3.png)
=1(y>0)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100716253583625/SYS201311031007162535836003_ST/4.png)
-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100716253583625/SYS201311031007162535836003_ST/5.png)
=1或
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100716253583625/SYS201311031007162535836003_ST/6.png)
-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100716253583625/SYS201311031007162535836003_ST/7.png)
=1
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100716253583625/SYS201311031007162535836003_ST/8.png)
-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100716253583625/SYS201311031007162535836003_ST/9.png)
=1
E.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100716253583625/SYS201311031007162535836003_ST/10.png)
-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100716253583625/SYS201311031007162535836003_ST/11.png)
=1(x>0)
查看答案
抛物线y=x
2上一点到直线2x-y-4=0的距离最短的点的坐标是( )
A.(1,1)
B.(
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100716253583625/SYS201311031007162535836002_ST/0.png)
)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100716253583625/SYS201311031007162535836002_ST/1.png)
D.(2,4)
查看答案
设p、q是两个命题,则“复合命题p或q为真,p且q为假”的充要条件是( )
A.p、q中至少有一个为真
B.p、q中至少有一个为假
C.p、q中中有且只有一个为真
D.p为真,q为假
查看答案
下列是全称命题且是真命题的是( )
A.∀x∈R,x
2>0
B.∀x∈Q,x
2∈Q
C.∃x
∈Z,x
2>1
D.∀x,y∈R,x
2+y
2>0
查看答案
已知函数f(x)=a(x-1)+lnx;
(1)若f(x)≥0在其定义域上恒成立,求a的取值所构成的集合;
(2)在函数f(x)的图象任意给定相异两点A(x
1,f(x
1))、B(x
2,f(x
2)),其中x
1<x
2,是否总存在x
∈(x
1,x
2)使得f′(x
)=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100716253436121/SYS201311031007162534361020_ST/0.png)
?请说明理由!
查看答案