问题
解答题
解下列方程:
(1)x2-2x-3=0
(2)(x-1)2-2x(x-1)=0.
答案
(1)x2-2x-3=0,
(x-3)(x+1)=0,
x-3=0,x+1=0,
x1=3,x2=-1.
(2)(x-1)2-2x(x-1)=0,
(x-1)(x-1-2x)=0,
x-1=0,x-1-2x=0,
x1=1,x2=-1.
解下列方程:
(1)x2-2x-3=0
(2)(x-1)2-2x(x-1)=0.
(1)x2-2x-3=0,
(x-3)(x+1)=0,
x-3=0,x+1=0,
x1=3,x2=-1.
(2)(x-1)2-2x(x-1)=0,
(x-1)(x-1-2x)=0,
x-1=0,x-1-2x=0,
x1=1,x2=-1.