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在平面直角坐标系中,函数y=-x+1与y=-(x-1)2的图象大致是( ) A....
在平面直角坐标系中,函数y=-x+1与y=-
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(x-1)
2的图象大致是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101185729590389702/SYS201311011857295903897007_ST/images1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101185729590389702/SYS201311011857295903897007_ST/images2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101185729590389702/SYS201311011857295903897007_ST/images3.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101185729590389702/SYS201311011857295903897007_ST/images4.png)
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如图,每个小正方形边长均为1,则下列图中的三角形(阴影部分)与左图中△ABC相似的是( )
A.
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B.
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C.
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D.
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在Rt△ABC中,∠C=90°,AB=4,BC=1,则cosA的值是( )
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C.
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C.
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D.
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