满分5 >
初中数学试题 >
如果一个三角形的三边均满足方程x2-10x+25=0,则此三角形的面积是 .
如果一个三角形的三边均满足方程x2-10x+25=0,则此三角形的面积是 .
考点分析:
相关试题推荐
如图,AB是⊙O的直径,C是⊙O上的一点,若
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000342952766278/SYS201311030003429527662011_ST/0.png)
,∠A=30°,OD⊥BC于点D,则BD的长为
.
查看答案
若x=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000342952766278/SYS201311030003429527662010_ST/0.png)
,则代数式x
2-4x+3的值为
.
查看答案
分别以n边形的顶点为圆心,以单位1为半径画圆,如图所示,则图中阴影部分的面积之和是多少个平方单位?( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000342952766278/SYS201311030003429527662009_ST/images0.png)
A.πn
2B.2πn
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000342952766278/SYS201311030003429527662009_ST/0.png)
D.π
查看答案
如图,AB是⊙O的直径,CD为弦,CD⊥AB于E,则①∠COE=∠DOE,②CE=DE,③
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000342952766278/SYS201311030003429527662008_ST/0.png)
,④
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000342952766278/SYS201311030003429527662008_ST/1.png)
,
其中正确的结论是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000342952766278/SYS201311030003429527662008_ST/images2.png)
A.①②④
B.②③④
C.①②③④
D.①②
查看答案
使式子
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000342952766278/SYS201311030003429527662007_ST/0.png)
有意义的x的取值范围是( )
A.x≥-1
B.x≠-1
C.x>-1且x≠1
D.x>-1
查看答案