如图所示在四边形ABCD中,∠ADC=∠BCD>90°,AC与BD交于P点,过A作AF∥BC交BD延长线于F,过B作BE∥AD交AC延长线于E.求证:
(1)PE=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022160539762484569/SYS201310221605397624845008_ST/0.png)
;
(2)CD∥EF.
考点分析:
相关试题推荐
设二次函数y=ax
2+bx+c的图象开口向下,顶点落在第二象限.
(1)确定a,b,b
2-4ac的符号,简述理由.
(2)若此二次函数图象经过原点,且顶点在直线x+y=0上,顶点与原点的距离为3
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022160539762484569/SYS201310221605397624845007_ST/0.png)
,求抛物线的解析式.
查看答案
如图所示:两个同心圆,半径分别是
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022160539762484569/SYS201310221605397624845006_ST/0.png)
和
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022160539762484569/SYS201310221605397624845006_ST/1.png)
,矩形ABCD边AB,CD分别为两圆的弦,当矩形ABCD面积取最大值时,矩形ABCD的周长是
.
查看答案
如图所示:在平面直角坐标系中,△OCB的外接圆与y轴交于A(0,
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022160539762484569/SYS201310221605397624845005_ST/0.png)
),∠OCB=60°,∠COB=45°,则OC=
.
查看答案
在平面直角坐标系中,横坐标与纵坐标都是整数的点(x,y)称为整点,如果将二次函数y=x
2+8x-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022160539762484569/SYS201310221605397624845004_ST/0.png)
的图象与x轴所围成的封闭图形染成红色,则此红色区域内部及其边界上的整点个数有
个.
查看答案
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022160539762484569/SYS201310221605397624845003_ST/images0.png)
如图所示,设M是△ABC的重心,过M的直线分别交边AB,AC于P,Q两点,且
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022160539762484569/SYS201310221605397624845003_ST/0.png)
=m,
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022160539762484569/SYS201310221605397624845003_ST/1.png)
=n,则
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022160539762484569/SYS201310221605397624845003_ST/2.png)
+
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022160539762484569/SYS201310221605397624845003_ST/3.png)
=
.
查看答案