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用配方法解方程 x 2 - 6 x + 5 = 0 ,配方后所得的方程是 ( )
( x + 3 ) 2 = - 4
( x - 3 ) 2 = - 4
( x + 3 ) 2 = 4
( x - 3 ) 2 = 4
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