x2﹣4x+1=0（*法）                                         ...

問題詳情：

x2﹣4x+1=0（*法）                                                                       

【回答】

x2﹣4x+4=4﹣1，                                                                                

∴（x﹣2）2=3，                                                                                

∴x=2±；                                                                                     

知識點：解一元二次方程

題型：計算題