X2-2X=2X十1怎么解法?

2025-07-21 10:55:40
推荐回答(3个)
回答1:

x²-2x=2x+1
x²-2x-2x-1=0
x²-4x-1=0
x²-4x+4-4-1=0
(x-2)²=5
x-2=±√5
x=±√5+2

回答2:

x^2-4x-1=0
(x-2)^2=3
x=±√3+2

回答3:

5