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用配方法解一元二次方程x2-6x-7=0,则方程变形为( ) A.(x-6)2=...
用配方法解一元二次方程x2-6x-7=0,则方程变形为( )
A.(x-6)2=43
B.(x+6)2=43
C.(x-3)2=16
D.(x+3)2=16
考点分析:
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