把多项式2x2-8分解因式得: .
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如图,等腰Rt△ABC(∠ACB=90°)的直角边与正方形DEFG的边长均为2,且AC与DE在同一直线上,开始时点C与点D重合,让△ABC沿这条直线向右平移,直到点A与点E重合为止.设CD的长为x,△ABC与正方形DEFG重合部分(图中阴影部分)的面积为y,则y与x之间的函数关系的图象大致是( )
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A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164818765311806/SYS201310221648187653118009_ST/images1.png)
B.
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C.
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D.
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甲、乙、丙、丁四位选手各10次射击成绩的平均数都是8环,众数和方差如表,则这四人中水平发挥最稳定的是( )
选手 | 甲 | 乙 | 丙 | 丁 |
众数(环) | 9 | 8 | 8 | 10 |
方差(环2) | 0.035 | 0.015 | 0.025 | 0.27 |
A.甲
B.乙
C.丙
D.丁
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已知一个等腰三角形两内角的度数之比为1:4,则这个等腰三角形顶角的度数为( )
A.20°或100°
B.120°
C.20°或120°
D.36°
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将如图所示的Rt△ABC绕直角边AC旋转一周,所得几何体的主视图是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164818765311806/SYS201310221648187653118006_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164818765311806/SYS201310221648187653118006_ST/images1.png)
B.
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C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164818765311806/SYS201310221648187653118006_ST/images3.png)
D.
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下列图形中,是中心对称图形的是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164818765311806/SYS201310221648187653118005_ST/images0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164818765311806/SYS201310221648187653118005_ST/images1.png)
C.
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D.
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