题目内容

解方程:x2-6x+1=0.

解法1:x2-6x+1=0

 ∵ b2-4ac=(-6)2-4=32                                        

     

                                                                

x                                             

    =                                                     

    =3±2.                                                      

 即x1=3+2x2=3-2.                                        

 解法2:x2-6x+1=0

 (x-3)2-8=0                                                   

 (x-3)2 =8                                                       

 x-3=±2                                                    

 即x1=3+2x2=3-2.                                      

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