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一元二次方程x2-1=0的根为( ) A.x=1 B.x=-1 C.x1=1,x...
一元二次方程x2-1=0的根为( )
A.x=1
B.x=-1
C.x1=1,x2=-1
D.x=2
考点分析:
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一元二次方程(1-k)x
2-2x-1=0有两个不相等的实数根,则k的取值范围是( )
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B.k<2且k≠1
C.k<2
D.k>2且k≠1
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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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D.
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若A=
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=( )
A.a
2+4
B.a
2+2
C.(a
2+2)
2D.(a
2+4)
2
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下列二次根式中是最简二次根式的是( )
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C.
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D.
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要使二次根式
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有意义,则x的取值范围是( )
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B.x≥4
C.x≠-4
D.x≥-4
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