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关于x的一元二次方程k2x2-(2k+1)x+1=0有两个实数根,则k的取值范围...
关于x的一元二次方程k2x2-(2k+1)x+1=0有两个实数根,则k的取值范围是 .
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如图,在平面直角坐标系中,⊙P的圆心是(2,a)(a>2),半径为2,函数y=x的图象被⊙P截得的弦AB的长为
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,则a的值是( )
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A.2
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B.2+
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C.2
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D.2+
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在同一直角坐标系中,一次函数y=ax+c和二次函数y=ax
2+bx+c的图象大致为( )
A.
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B.
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C.
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D.
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