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若方程25x2-(k-1)x+1=0的左边可以写成一个完全平方式;则k的值为( ...
若方程25x2-(k-1)x+1=0的左边可以写成一个完全平方式;则k的值为( )
A.-9或11
B.-7或8
C.-8或9
D.-6或7
考点分析:
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2的根是( )
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B.4
C.
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或4
D.无解
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若方程ax
2+bx+c=0(a≠0)满足a+b+c=0,则方程必有一根为( )
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B.1
C.-1
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形如(x+m)
2=n(n≥0)的方程,它的根是( )
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B.x=±m+
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C.x=±
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D.x=-m±
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方程4(2x-3)
2=25的根是( )
A.±
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B.
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C.
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D.
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或
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一元二次方程x
2-1=0的根为( )
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