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现有2008年奥运会福娃卡片20张,其中贝贝6张,京京5张,欢欢4张,迎迎3张,...
现有2008年奥运会福娃卡片20张,其中贝贝6张,京京5张,欢欢4张,迎迎3张,妮妮2张,每张卡片大小、质地均匀相同,将画有福娃的一面朝下反扣在桌子上,从中随机抽取一张,抽到京京的概率是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192912223192747/SYS201311011929122231927014_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192912223192747/SYS201311011929122231927014_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192912223192747/SYS201311011929122231927014_ST/2.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192912223192747/SYS201311011929122231927014_ST/3.png)
考点分析:
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如图,⊙O中,弦AB的长为6cm,圆心O到AB的距离为4cm,则⊙O的半径长为( )
A.3cm
B.4cm
C.5cm
D.6cm
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如图,已知∠ACB是⊙O的圆周角,∠ACB=50°,则圆心角∠AOB是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192912223192747/SYS201311011929122231927012_ST/images0.png)
A.40°
B.50°
C.80°
D.100°
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如果一次函数y=kx+b的图象经过第一象限,且与y轴负半轴相交,那么( )
A.k>0,b>0
B.k>0,b<0
C.k<0,b>0
D.k<0,b<0
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化简(-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192912223192747/SYS201311011929122231927010_ST/0.png)
)÷
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192912223192747/SYS201311011929122231927010_ST/1.png)
的结果是( )
A.-x-1
B.-x+1
C.-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192912223192747/SYS201311011929122231927010_ST/2.png)
D.
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方程组:
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192912223192747/SYS201311011929122231927009_ST/0.png)
,由②-①,得正确的方程是( )
A.3x=10
B.x=5
C.3x=-5
D.x=-5
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