满分5 >
初中数学试题 >
(2008•杭州)在Rt△ABC中,∠C为直角,CD⊥AB于点D.BC=3,AB...
(2008•杭州)在Rt△ABC中,∠C为直角,CD⊥AB于点D.BC=3,AB=5,写出其中的一对相似三角形是
和
;并写出它的面积比
.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230723832139879/SYS201310212307238321398011_ST/images0.png)
考点分析:
相关试题推荐
(2004•三明)函数
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230723832139879/SYS201310212307238321398010_ST/0.png)
中自变量x的取值范围是
.
查看答案
(2010•下城区模拟)如图,矩形的长与宽分别为a和b,在矩形中截取两个大小相同的圆作为圆柱的上下底面,剩余的矩形作为圆柱的侧面,刚好能组合成一个没有空隙的圆柱,则a和b要满足什么数量关系( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230723832139879/SYS201310212307238321398009_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230723832139879/SYS201310212307238321398009_ST/0.png)
=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230723832139879/SYS201310212307238321398009_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230723832139879/SYS201310212307238321398009_ST/2.png)
=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230723832139879/SYS201310212307238321398009_ST/3.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230723832139879/SYS201310212307238321398009_ST/4.png)
=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230723832139879/SYS201310212307238321398009_ST/5.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230723832139879/SYS201310212307238321398009_ST/6.png)
=
查看答案
(2011•保康县模拟)如图,在直角梯形ABCD中,AD∥BC,∠C=90°,CD=6cm,AD=2cm,动点P、Q同时从点B出发,点P沿BA,AD,DC运动到点C停止,点Q沿BC运动到C点停止,两点运动时的速度都是1cm/s,而当点P到达点A时,点Q正好到达点C.设P点运动的时间为t(s),△BPQ的面积为y(cm
2).下图中能正确表示整个运动中y关于t的函数关系的大致图象是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230723832139879/SYS201310212307238321398008_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230723832139879/SYS201310212307238321398008_ST/images1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230723832139879/SYS201310212307238321398008_ST/images2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230723832139879/SYS201310212307238321398008_ST/images3.png)
D.
查看答案
(2010•北仑区模拟)如图,AB是半圆O的直径,C、D、E三点在半圆上,H、K是直径AB上的点,若∠AHC=∠DHB,∠DKA=∠EKB,已知弧AC为30°,弧BE为70°,则∠HDK=( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230723832139879/SYS201310212307238321398007_ST/images0.png)
A.30°
B.40°
C.70°
D.80°
查看答案
(2010•黔南州)已知⊙O
1和⊙O
2的半径分别为1和4,如果两圆的位置关系为相交,那么圆心距O
1O
2的取值范围在数轴上表示正确的是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230723832139879/SYS201310212307238321398006_ST/images0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230723832139879/SYS201310212307238321398006_ST/images1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230723832139879/SYS201310212307238321398006_ST/images2.png)
D.
查看答案