满分5 >
高中数学试题 >
从6名男生和2名女生中选出3名志愿者,其中至少有1名女生的选法共有( ) A.3...
从6名男生和2名女生中选出3名志愿者,其中至少有1名女生的选法共有( )
A.30种
B.36种
C.42种
D.60种
考点分析:
相关试题推荐
已知两条直线m,n,两个平面α,β,给出下面四个命题:
①m∥n,m⊥α⇒n⊥α
②α∥β,m⊂α,n⊂β⇒m∥n
③m∥n,m∥α⇒n∥α
④α∥β,m∥n,m⊥α⇒n⊥β
其中正确命题的序号是( )
A.①③
B.②④
C.①④
D.②③
查看答案
要得到函数y=sin(2x+1)的图象,只要将函数y=sin2x的图象( )
A.向左平移1个单位
B.向右平移1个单位
C.向左平移
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102407953624832/SYS201311031024079536248004_ST/0.png)
个单位
D.向右平移
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102407953624832/SYS201311031024079536248004_ST/1.png)
个单位
查看答案
函数y=x
2-1(x≥0)的反函数是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102407953624832/SYS201311031024079536248003_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102407953624832/SYS201311031024079536248003_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102407953624832/SYS201311031024079536248003_ST/2.png)
D.
查看答案
向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102407953624832/SYS201311031024079536248002_ST/0.png)
=(1,-2),
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102407953624832/SYS201311031024079536248002_ST/1.png)
=(6,3),则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102407953624832/SYS201311031024079536248002_ST/2.png)
与
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102407953624832/SYS201311031024079536248002_ST/3.png)
的夹角为( )
A.60°
B.90°
C.120°
D.150°
查看答案
若a、b是任意实数,且a>b,则下列不等式成立的是( )
A.a
2>b
2B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102407953624832/SYS201311031024079536248001_ST/0.png)
C.lg(a-b)>0
D.
查看答案