满分5 >
初中数学试题 >
(2009•嘉兴)如图,等腰△ABC中,底边BC=a,∠A=36°,∠ABC的平...
(2009•嘉兴)如图,等腰△ABC中,底边BC=a,∠A=36°,∠ABC的平分线交AC于D,∠BCD的平分线交BD于E,设k=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230612528852055/SYS201310212306125288520004_ST/0.png)
,则DE=( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230612528852055/SYS201310212306125288520004_ST/images1.png)
A.k
2a
B.k
3a
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230612528852055/SYS201310212306125288520004_ST/1.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230612528852055/SYS201310212306125288520004_ST/2.png)
考点分析:
相关试题推荐
(2009•义乌)同时抛掷两枚质地均匀的骰子,骰子的六个面分别刻有1到6的点数,朝上的面的点数中,一个点数能被另一个点数整除的概率是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230612528852055/SYS201310212306125288520003_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230612528852055/SYS201310212306125288520003_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230612528852055/SYS201310212306125288520003_ST/2.png)
D.
查看答案
(2009•嘉兴)沪杭高速铁路已开工建设,某校研究性学习以此为课题,在研究列车的行驶速度时,得到一个数学问题.如图,若v是关于t的函数,图象为折线O-A-B-C,其中A(t
1,350),B(t
2,350),C(
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230612528852055/SYS201310212306125288520002_ST/0.png)
,0),四边形OABC的面积为70,则t
2-t
1=( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230612528852055/SYS201310212306125288520002_ST/images1.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230612528852055/SYS201310212306125288520002_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230612528852055/SYS201310212306125288520002_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230612528852055/SYS201310212306125288520002_ST/3.png)
D.
查看答案
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230612528852055/SYS201310212306125288520001_ST/images0.png)
(2009•丽水)如图,已知△ABC中,∠ABC=90°,AB=BC,三角形的顶点在相互平行的三条直线l
1,l
2,l
3上,且l
1,l
2之间的距离为2,l
2,l
3之间的距离为3,则AC的长是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230612528852055/SYS201310212306125288520001_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230612528852055/SYS201310212306125288520001_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230612528852055/SYS201310212306125288520001_ST/2.png)
D.7
查看答案
(2009•嘉兴)已知a≠0,在同一直角坐标系中,函数y=ax与y=ax
2的图象有可能是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230612528852055/SYS201310212306125288520000_ST/images0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230612528852055/SYS201310212306125288520000_ST/images1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230612528852055/SYS201310212306125288520000_ST/images2.png)
D.
查看答案
(2010•拱墅区二模)如图,已知正比例函数和反比例函数的图象都经过点M(-3,-1),且知点P(-1,-3)是反比例函数图象上的点:
(1)分别求出正比例函数和反比例函数的解析式;
(2)作PA⊥x轴,垂足为A,当点Q在直线MO上运动时,作QB⊥y轴,垂足为B,问:直线MO上是否存在这样的点Q,使得△OBQ与△OAP面积相等?如果存在,请求出点Q的坐标,如果不存在,请说明理由;
(3)当点Q在第一象限中的双曲线上运动时,作以OP、OQ为邻边的▱OPCQ,求▱OPCQ周长的最小值以及取得最小值时点Q的坐标.
查看答案