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(2009•兰州)如图所示,将一张正方形纸片对折两次,然后在上面打3个洞,则纸片...
(2009•兰州)如图所示,将一张正方形纸片对折两次,然后在上面打3个洞,则纸片展开后是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230847577699167/SYS201310212308475776991004_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230847577699167/SYS201310212308475776991004_ST/images1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230847577699167/SYS201310212308475776991004_ST/images2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230847577699167/SYS201310212308475776991004_ST/images3.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230847577699167/SYS201310212308475776991004_ST/images4.png)
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(2009•山西)下列计算正确的是( )
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(2010•锦州)如图,抛物线与x轴交于A(x
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(2)点P是线段AB上的动点,过点P作PE∥AC,交BC于点E,连接CP,当△CPE的面积最大时,求点P的坐标;
(3)探究:若点Q是抛物线对称轴上的点,是否存在这样的点Q,使△QBC成为等腰三角形?若存在,请直接写出所有符合条件的点Q的坐标;若不存在,请说明理由.
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