在△ABC中,a,b,c分别是角A,B,C的对边,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101703367143030/SYS201311031017033671430017_ST/0.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101703367143030/SYS201311031017033671430017_ST/1.png)
.
(1)求△ABC的面积;
(2)若a=7,求角C.
考点分析:
相关试题推荐
已知P、Q为△ABC内两点,且满足
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101703367143030/SYS201311031017033671430016_ST/0.png)
=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101703367143030/SYS201311031017033671430016_ST/1.png)
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101703367143030/SYS201311031017033671430016_ST/2.png)
+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101703367143030/SYS201311031017033671430016_ST/3.png)
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101703367143030/SYS201311031017033671430016_ST/4.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101703367143030/SYS201311031017033671430016_ST/5.png)
=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101703367143030/SYS201311031017033671430016_ST/6.png)
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101703367143030/SYS201311031017033671430016_ST/7.png)
+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101703367143030/SYS201311031017033671430016_ST/8.png)
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101703367143030/SYS201311031017033671430016_ST/9.png)
,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101703367143030/SYS201311031017033671430016_ST/10.png)
═
.
查看答案
已知椭圆的中心在原点,焦点在x轴上,长轴长为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101652031536689/SYS201311031016520315366036_ST/0.png)
,且经过点
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101652031536689/SYS201311031016520315366036_ST/1.png)
.若直线x+y-1=0与椭圆交于两点P,Q,求证:OP⊥OQ.
查看答案
过双曲线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101652031536689/SYS201311031016520315366035_ST/0.png)
的右焦点F作倾角为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101652031536689/SYS201311031016520315366035_ST/1.png)
的弦AB,求弦长|AB|及线段AB的中点C到F的距离.
查看答案
已知函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101652031536689/SYS201311031016520315366034_ST/0.png)
,
(1)将函数化成正弦型函数的形式;
(2)指出函数的周期;
(3)指出当x取何值时,函数取最大值,最大值为多少?
查看答案
某种图书原定价为每本10元,预计售出总量为1万册,经过市场分析,如果每本价格上涨x%,售出总量将减少0.5x%,问x为何值时,这种书的销售额最大?此时每本书的售价是多少?最大销售额为多少?
查看答案