满分5 >
高中数学试题 >
在△ABC中,a,b,c分别是角A,B,C的对边,且,则角B的大小为 .
在△ABC中,a,b,c分别是角A,B,C的对边,且
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231432347973275/SYS201311012314323479732013_ST/0.png)
,则角B的大小为
.
考点分析:
相关试题推荐
已知向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231432347973275/SYS201311012314323479732012_ST/0.png)
、
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231432347973275/SYS201311012314323479732012_ST/1.png)
的夹角为120°,且
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231432347973275/SYS201311012314323479732012_ST/2.png)
,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231432347973275/SYS201311012314323479732012_ST/3.png)
为
.
查看答案
若圆x
2+y
2-4x-4y-10=0上至少有三个不同的点到直线l:ax+by=0的距离为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231432347973275/SYS201311012314323479732011_ST/0.png)
,则直线l的倾斜角的取值范围是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231432347973275/SYS201311012314323479732011_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231432347973275/SYS201311012314323479732011_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231432347973275/SYS201311012314323479732011_ST/3.png)
D.
查看答案
如图,目标函数P=ax+y仅在封闭区域OACB内(包括边界)的点
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231432347973275/SYS201311012314323479732010_ST/0.png)
处取得最大值,则a的取值范围是( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231432347973275/SYS201311012314323479732010_ST/images1.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231432347973275/SYS201311012314323479732010_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231432347973275/SYS201311012314323479732010_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231432347973275/SYS201311012314323479732010_ST/3.png)
D.
查看答案
已知y=Asin(ωx+ϕ)的最大值为1,在区间
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231432347973275/SYS201311012314323479732009_ST/0.png)
上,函数值从1减小到-1,函数图象(如图)与y轴的交点P坐标是( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231432347973275/SYS201311012314323479732009_ST/images1.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231432347973275/SYS201311012314323479732009_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231432347973275/SYS201311012314323479732009_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231432347973275/SYS201311012314323479732009_ST/3.png)
D.以上都不是
查看答案
已知f(x)=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231432347973275/SYS201311012314323479732008_ST/0.png)
的导函数为f′(x),则f′(i)=(i为虚数单位)( ).
A.-1-2i
B.-2-2i
C.-2+2i
D.2-2i
查看答案