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用配方法解方程:x2-4x+2=0,下列配方正确的是( ) A.(x-2)2=2...
用配方法解方程:x2-4x+2=0,下列配方正确的是( )
A.(x-2)2=2
B.(x+2)2=2
C.(x-2)2=-2
D.(x-2)2=6
考点分析:
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