满分5 >
高中数学试题 >
在△ABC中,a=sin(A+B),b=sinA+sinB,则a与b的大小关系为...
在△ABC中,a=sin(A+B),b=sinA+sinB,则a与b的大小关系为 .
考点分析:
相关试题推荐
设
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225021023891863/SYS201311012250210238918011_ST/0.png)
与
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225021023891863/SYS201311012250210238918011_ST/1.png)
的夹角为θ,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225021023891863/SYS201311012250210238918011_ST/2.png)
=(3,3),2
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225021023891863/SYS201311012250210238918011_ST/3.png)
-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225021023891863/SYS201311012250210238918011_ST/4.png)
=(-1,1),则cosθ=
查看答案
已知a,b,c是直角三角形的三边,其中c为斜边,若实数M使不等式
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225021023891863/SYS201311012250210238918009_ST/0.png)
恒成立,则实数M的最大值是( )
A.6+2
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225021023891863/SYS201311012250210238918009_ST/1.png)
B.5
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225021023891863/SYS201311012250210238918009_ST/2.png)
C.6
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225021023891863/SYS201311012250210238918009_ST/3.png)
D.9
查看答案
已知f(x)是定义在(-3,3)上的奇函数,当0<x<3时,f(x)的图象如图所示,那么不等式f(x)•cosx<0的解集为( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225021023891863/SYS201311012250210238918008_ST/images0.png)
A.(-3,-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225021023891863/SYS201311012250210238918008_ST/0.png)
)∪(0,1)∪(
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225021023891863/SYS201311012250210238918008_ST/1.png)
,3)
B.(-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225021023891863/SYS201311012250210238918008_ST/2.png)
,-1)∪(0,1)∪(
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225021023891863/SYS201311012250210238918008_ST/3.png)
,3)
C.(-3,-1)∪(0,1)∪(1,3)
D.(-3,-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225021023891863/SYS201311012250210238918008_ST/4.png)
)∪(0,1)∪(1,3)
查看答案
若不等式x
2+ax+4≥0对一切x∈(0,1]成立,则a的最小值( )
A.0
B.-3
C.-4
D.-5
查看答案