用配方法解方程x눀-2x-3=0,原方程应变形为?

2024-11-07 20:37:49
推荐回答(2个)
回答1:

x²-2x-3=0
(x-1)²-1-3=0
(x-1)²-4=0
(x-1)²=4
x-1=±2
x1=3
x2=-1

回答2:

(x-3)(x+1)