二次函数y=x2+6x-5的图象的对称轴是直线 .
考点分析:
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如图,在△ABC中,点D、E分别在边AB、AC上,DE∥BC,AD:BD=1:2,那么S
△DBE:S
△CBE等于( )
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A.1:2
B.1:3
C.1:4
D.1:6
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对一个图形进行放缩时,下列说法中正确的是( )
A.图形中线段的长度与角的大小都保持不变
B.图形中线段的长度与角的大小都会改变
C.图形中线段的长度保持不变、角的大小可以改变
D.图形中线段的长度可以改变、角的大小保持不变
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如图,在△ABC中,D是边BC的中点,
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,
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,那么
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022160348144261348/SYS201310221603481442613003_ST/2.png)
等于( )
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A.
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B.
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C.
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D.
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抛物线y=-3x
2向左平移2个单位后得到的抛物线为( )
A.y=-3x
2+2
B.y=-3x
2-2
C.y=-3(x+2)
2D.y=-3(x-2)
2
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坡度等于1:
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的斜坡的坡角等于( )
A.30°
B.40°
C.50°
D.60°
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