阅读与解答:
古希腊的几何学家海伦,在他的著作《度量》一书中,给出了下面一个公式:
如果一个三角形的三边长分别为a,b,c,设p=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000713366627967/SYS201311030007133666279020_ST/0.png)
,则三角形的面积为S=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000713366627967/SYS201311030007133666279020_ST/1.png)
.
请你解答:在△ABC中,BC=4,AC=5,AB=6,求△ABC的面积.
考点分析:
相关试题推荐
如图,某小区在宽20m,长32m的矩形地面上修筑同样宽的人行道(图中阴影部分),余下的部分种上草坪.要使草坪的面积为540m
2,求道路的宽.
查看答案
已知
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000713366627967/SYS201311030007133666279018_ST/0.png)
,b=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000713366627967/SYS201311030007133666279018_ST/1.png)
,求代数式a
2-3ab+b
2的值.
查看答案
解方程
(1)(3x-4)
2=(3-4x)
2;
(2)x
2+x-1=0(配方法).
查看答案
观察下列二次根式的化简:
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000713366627967/SYS201311030007133666279015_ST/0.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000713366627967/SYS201311030007133666279015_ST/1.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000713366627967/SYS201311030007133666279015_ST/2.png)
,…从计算结果中找到规律,再利用这一规律计算下列式子的值.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000713366627967/SYS201311030007133666279015_ST/3.png)
=
.
查看答案