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如图,直线y=-x+4与两坐标轴分别交于A、B两点,边长为2的正方形OCEF沿着...
如图,直线y=-x+4与两坐标轴分别交于A、B两点,边长为2的正方形OCEF沿着x轴的正方向移动,设平移的距离为a(0≤a≤4),正方形OCEF与△AOB重叠部分的面积为S.则表示S与a的函数关系的图象大致是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000613935586237/SYS201311030006139355862007_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000613935586237/SYS201311030006139355862007_ST/images1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000613935586237/SYS201311030006139355862007_ST/images2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000613935586237/SYS201311030006139355862007_ST/images3.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000613935586237/SYS201311030006139355862007_ST/images4.png)
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已知二次函数y=ax
2+bx+c(a≠0)的图象如图所示,给出以下结论:
①因为a>0,所以函数y有最大值;
②该函数的图象关于直线x=-1对称;
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