满分5 >
高中数学试题 >
如图,在四边形ABCD中,AB⊥BC,AD⊥DC.若||=a,||=b,则=( ...
如图,在四边形ABCD中,AB⊥BC,AD⊥DC.若|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102354187250055/SYS201311031023541872500006_ST/0.png)
|=a,|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102354187250055/SYS201311031023541872500006_ST/1.png)
|=b,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102354187250055/SYS201311031023541872500006_ST/2.png)
=( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102354187250055/SYS201311031023541872500006_ST/images3.png)
A.a
2-b
2B.b
2-a
2C.a
2+b
2D.ab
考点分析:
相关试题推荐
函数y=sin (2x+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102354187250055/SYS201311031023541872500005_ST/0.png)
)的图象可由函数y=cos 2x的图象( )
A.向左平移
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102354187250055/SYS201311031023541872500005_ST/1.png)
个单位长度而得到
B.向右平移
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102354187250055/SYS201311031023541872500005_ST/2.png)
个单位长度而得到
C.向左平移
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102354187250055/SYS201311031023541872500005_ST/3.png)
个单位长度而得到
D.向右平移
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102354187250055/SYS201311031023541872500005_ST/4.png)
个单位长度而得到
查看答案
设有直线m、n和平面α、β.下列四个命题中,正确的是( )
A.若m∥α,n∥α,则m∥n
B.若m⊂α,n⊂α,m∥β,n∥β,则α∥β
C.若α⊥β,m⊂α,则m⊥β
D.若α⊥β,m⊥β,m⊈α,则m∥α
查看答案
已知“命题p:(x-m)
2>3(x-m)”是“命题q:x
2+3x-4<0”成立的必要不充分条件,则实数m的取值范围为( )
A.m>1或m<-7
B.m≥1或m≤-7
C.-7<m<1
D.-7≤m≤1
查看答案
已知f(x)=x
3+asinx-b
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102354187250055/SYS201311031023541872500002_ST/0.png)
+9(a,b∈R),且f(-2013)=7,则f(2013)=( )
A.11
B.12
C.13
D.14
查看答案
函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102354187250055/SYS201311031023541872500001_ST/0.png)
的最小值( )
A.-2
B.2
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102354187250055/SYS201311031023541872500001_ST/1.png)
D.
查看答案