用配方法解方程 x^2-2x-1=0 x^2-2x+4 x^2-2x+1=0

2024-12-17 04:08:59
推荐回答(1个)
回答1:

x^2-2x-1=0
x²-2x+1=2
(x-1)²=2
x-1=±√2
x=1+√2 x=1-√2

x^2-2x+4 =0
(x-1)²=-3
无解

x^2-2x+1=0
(x-1)²=0
x-1=0
x=1