满分5 >
高中数学试题 >
在△ABC中,角A、B、C的对边分别为a、b、c,如果cos(2B+C)+2si...
在△ABC中,角A、B、C的对边分别为a、b、c,如果cos(2B+C)+2sinAsinB<0,那么三边长a、b、c之间满足的关系是( )
A.2ab>c2
B.a2+b2<c2
C.2bc>a2
D.b2+c2<a2
考点分析:
相关试题推荐
设函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101422211835303/SYS201311031014222118353008_ST/0.png)
,若数列{a
n}是单调递减数列,则实数a的取值范围为( )
A.(-∞,2)
B.(-∞,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101422211835303/SYS201311031014222118353008_ST/1.png)
C.(-∞,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101422211835303/SYS201311031014222118353008_ST/2.png)
)
D.
查看答案
已知函数f(x)=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101422211835303/SYS201311031014222118353007_ST/0.png)
,若a,b,c互不相等,且f(a)=f(b)=f(c),则a+b+c的取值范围是( )
A.(1,2013)
B.(1,2014)
C.(2,2013)
D.(2,2014)
查看答案
在平面直角坐标系中,若不等式
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101422211835303/SYS201311031014222118353006_ST/0.png)
(a为常数)所表示的平面区域内的面积等于2,则a的值为( )
A.-5
B.1
C.2
D.3
查看答案
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101422211835303/SYS201311031014222118353005_ST/images0.png)
已知函数y=sinax+b(a>0)的如图如图所示,则函数y=log
a(x+b)的图象可能是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101422211835303/SYS201311031014222118353005_ST/images1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101422211835303/SYS201311031014222118353005_ST/images2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101422211835303/SYS201311031014222118353005_ST/images3.png)
D.
查看答案
如图,在△ABC中,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101422211835303/SYS201311031014222118353004_ST/0.png)
,P是BN上的一点,若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101422211835303/SYS201311031014222118353004_ST/1.png)
,则实数m的值为( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101422211835303/SYS201311031014222118353004_ST/images2.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101422211835303/SYS201311031014222118353004_ST/2.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101422211835303/SYS201311031014222118353004_ST/3.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101422211835303/SYS201311031014222118353004_ST/4.png)
D.
查看答案