满分5 >
高中数学试题 >
在三角形ABC中,A=120°,AB=5,BC=7,则的值为 .
在三角形ABC中,A=120°,AB=5,BC=7,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101913028889705/SYS201311031019130288897011_ST/0.png)
的值为
.
考点分析:
相关试题推荐
等比数列{a
n}中,a
n>0,a
1,a
9为方程x
2-10x+16=0的两根,则a
2a
5a
8 的值为
.
查看答案
△ABC中,A=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101913028889705/SYS201311031019130288897009_ST/0.png)
,BC=3,则△ABC的周长为( )
A.4
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101913028889705/SYS201311031019130288897009_ST/1.png)
sin(B+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101913028889705/SYS201311031019130288897009_ST/2.png)
)+3
B.4
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101913028889705/SYS201311031019130288897009_ST/3.png)
sin(B+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101913028889705/SYS201311031019130288897009_ST/4.png)
)+3
C.6sin(B+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101913028889705/SYS201311031019130288897009_ST/5.png)
)+3
D.6sin(B+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101913028889705/SYS201311031019130288897009_ST/6.png)
)+3
查看答案
如图是函数y=Asin(ωx+φ)的图象的一段,它的解析式为( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101913028889705/SYS201311031019130288897008_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101913028889705/SYS201311031019130288897008_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101913028889705/SYS201311031019130288897008_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101913028889705/SYS201311031019130288897008_ST/2.png)
D.
查看答案
下列叙述正确的是( )
A.等比数列的首项不能为零,但公比可以为零
B.等比数列的公比q>0时,是递增数列
C.若G
2=ab,则G是a,b的等比中项
D.已知等比数列{a
n}的通项公式a
n=(-2)
n,则它的公比q=-2
查看答案
下列各图中表示的区域是不等式3x+2y+6≥0的解的是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101913028889705/SYS201311031019130288897006_ST/images0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101913028889705/SYS201311031019130288897006_ST/images1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101913028889705/SYS201311031019130288897006_ST/images2.png)
D.
查看答案