满分5 >
初中数学试题 >
如图,已知O是四边形ABCD内一点,OA=OB=OC,∠ABC=∠ADC=65°...
如图,已知O是四边形ABCD内一点,OA=OB=OC,∠ABC=∠ADC=65°,则∠DAO+∠DCO的度数是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101191747649478141/SYS201311011917476494781004_ST/images0.png)
A.130°
B.230°
C.262.5°
D.165°
考点分析:
相关试题推荐
如图,在等边三角形ABC中,D为AC的中点,
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101191747649478141/SYS201311011917476494781003_ST/0.png)
,则和△AED(不包含△AED)相似的三角形有( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101191747649478141/SYS201311011917476494781003_ST/images1.png)
A.1个
B.2个
C.3个
D.4个
查看答案
小华拿一个矩形木框在阳光下玩,矩形木框在地面上形成的投影不可能的是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101191747649478141/SYS201311011917476494781002_ST/images0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101191747649478141/SYS201311011917476494781002_ST/images1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101191747649478141/SYS201311011917476494781002_ST/images2.png)
D.
查看答案
下列运算正确的是( )
A.x
2+x
3=x
5B.(x
2)
3=x
6C.(x-2)
2=x
2-4
D.x•x
-1=0
查看答案
(-3)
2的值是( )
A.-6
B.6
C.-9
D.9
查看答案
如图所示,在形状和大小不确定的△ABC中,BC=6,E、F分别是AB、AC的中点,P在EF或EF的延长线上,BP交CE于D,Q在CE上且BQ平分∠CBP,设BP=y,PE=x.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101191747649346773/SYS201311011917476493467023_ST/images0.png)
(1)当x=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101191747649346773/SYS201311011917476493467023_ST/0.png)
EF时,求S
△DPE:S
△DBC的值;
(2)当CQ=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101191747649346773/SYS201311011917476493467023_ST/1.png)
CE时,求y与x之间的函数关系式;
(3)①当CQ=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101191747649346773/SYS201311011917476493467023_ST/2.png)
CE时,求y与x之间的函数关系式;
②当CQ=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101191747649346773/SYS201311011917476493467023_ST/3.png)
CE(n为不小于2的常数)时,直接写出y与x之间的函数关系式.
查看答案