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如图,在▱ABCD中,E是AB的中点,AF=3,则FC等于 .
如图,在▱ABCD中,E是AB的中点,AF=3,则FC等于
.
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下列说法,正确的有( )个
(1)平面直角坐标系上的点与实数对一一对应;
(2)平分弦的直径垂直于这条弦;
(3)当b
2-4ac>0时,抛物线y=ax
2+bx+c(a≠0)与坐标轴一定有三个交点;
(4)如图,△ABC中,若BC=1,AB=2,则∠A=30°.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161658107353320/SYS201310221616581073533009_ST/images0.png)
A.0
B.1
C.2
D.3
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二次函数y=ax
2+bx+c的图象如图所示,反比例函数y=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161658107353320/SYS201310221616581073533008_ST/0.png)
与正比例函数y=(b+c)x在同一坐标系中的大致图象可能是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161658107353320/SYS201310221616581073533008_ST/images1.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161658107353320/SYS201310221616581073533008_ST/images2.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161658107353320/SYS201310221616581073533008_ST/images3.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161658107353320/SYS201310221616581073533008_ST/images4.png)
D.
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已知a,b为实数,则解可以为-1<x<1的不等式组是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161658107353320/SYS201310221616581073533007_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161658107353320/SYS201310221616581073533007_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161658107353320/SYS201310221616581073533007_ST/2.png)
D.
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