![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100012930100892/SYS201311031000129301008015_ST/images0.png)
△ABC中,D在边BC上,且BD=2,DC=1,∠B=60°,∠ADC=150°,求AC的长及△ABC的面积.
考点分析:
相关试题推荐
设a>b,给出下列结论:①ac
2>bc
2;②a
2>b
2;③
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100012930100892/SYS201311031000129301008014_ST/0.png)
;④a-c>b-c.其中正确结论的序号是
.
查看答案
在锐角△ABC中,角A、B、C的对边分别为a、b、c,若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100012930100892/SYS201311031000129301008013_ST/0.png)
+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100012930100892/SYS201311031000129301008013_ST/1.png)
=6cosC,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100012930100892/SYS201311031000129301008013_ST/2.png)
+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100012930100892/SYS201311031000129301008013_ST/3.png)
的值是
.
查看答案
在数列{a
n}中,a
1=1,且对于任意正整数n,都有a
n+1=a
n+n,则a
100=
.
查看答案
在△ABC中,sinA:sinB:sinC=1:2:
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100012930100892/SYS201311031000129301008011_ST/0.png)
,则∠C=
.
查看答案
用火柴棒按图的方法搭三角形:
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100012930100892/SYS201311031000129301008010_ST/images0.png)
按图示的规律搭下去,则所用火柴棒数a
n 与所搭三角形的个数n之间的关系式可以是
.
查看答案