一元二次方程2x2-x-1=0的一次项系数是 .
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命题“同位角相等,两直线平行”的逆命题是:
.
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如图,直线y=1与抛物线y=x
2-2x相交于M、N两点,则M、N两点的横坐标是下列哪个方程的解?( )
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A.x
2-2x+1=0
B.x
2-2x-1=0
C.x
2-2x-2=0
D.x
2-2x+2=0
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已知A(x
1,y
1)、B(x
2,y
2)都是函数
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图象上的点,且x
1<x
2<0,则y
1、y
2的大小是( )
A.y
1<y
2B.y
1=y
2C.y
1>y
2D.不能确定
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甲袋里有红、白两球,乙袋里有红、红、白三球,两袋的球除颜色不同外其他都相同,分别往两袋里任摸一球,同时摸到红球的概率是( )
A.
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B.
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C.
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D.
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△ABC中,∠C=90°,AC=4,BC=3,则sinA的值是( )
A.
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B.
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C.
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D.
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