满分5 >
高中数学试题 >
已知D是△ABC所在平面内一点,,则( ) A. B. C. D.
已知D是△ABC所在平面内一点,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102711456550204/SYS201311031027114565502008_ST/0.png)
,则( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102711456550204/SYS201311031027114565502008_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102711456550204/SYS201311031027114565502008_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102711456550204/SYS201311031027114565502008_ST/3.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102711456550204/SYS201311031027114565502008_ST/4.png)
考点分析:
相关试题推荐
设函数f(x)=cosωx(ω>0),将y=f(x)的图象向右平移
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102711456550204/SYS201311031027114565502007_ST/0.png)
个单位长度后,所得的图象与原图象重合,则ω的最小值等于( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102711456550204/SYS201311031027114565502007_ST/1.png)
B.3
C.6
D.9
查看答案
已知x,y满足线性约束条件
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102711456550204/SYS201311031027114565502006_ST/0.png)
,若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102711456550204/SYS201311031027114565502006_ST/1.png)
=(x,-2),
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102711456550204/SYS201311031027114565502006_ST/2.png)
=(1,y),则z=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102711456550204/SYS201311031027114565502006_ST/3.png)
•
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102711456550204/SYS201311031027114565502006_ST/4.png)
的最大值是( )
A.-1
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102711456550204/SYS201311031027114565502006_ST/5.png)
C.7
D.5
查看答案
设函数f(x)=xsinx+cosx的图象在点(t,f(t))处切线的斜率为k,则函数k=g(t)的部分图象为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102711456550204/SYS201311031027114565502005_ST/images0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102711456550204/SYS201311031027114565502005_ST/images1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102711456550204/SYS201311031027114565502005_ST/images2.png)
D.
查看答案
已知函数y=f(x-1)的图象关于点(1,0)对称,且当x∈(-∞,0)时,f(x)+xf′(x)<0成立(其中f′(x)是f(x)的导函数),若a=(3
0.3)•f(3
0.3),b=(log
π3)•f(log
π3),c=(log
3![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102711456550204/SYS201311031027114565502004_ST/0.png)
),则 a,b,c的大小关系是( )
A.a>b>c
B.c>a>b
C.c>b>a
D.a>c>b
查看答案
命题p:∀x∈[1,2],x
2-a≥0;命题q:∃x∈R,x
2+2ax+2-a=0,若命题p且q为真,则a取值范围为( )
A.a≤-2或a=1
B.a≤-2或1≤a≤2
C.a≥1
D.-2a≤a≤1
查看答案