问题
解答题
选择合适的方法解下列方程:
(1)2x2-3x=2
(2)(x-1)2+2x(x-1)=0.
答案
(1)2x2-3x=2
2x2-3x-2=0
(x-2)(2x+1)=0,
解得:x1=2,x2=-
;1 2
(2)(x-1)2+2x(x-1)=0
(x-1)[(x-1)+2x]=0
(x-1)(3x-1)=0,
解得:x1=1,x2=
.1 3
选择合适的方法解下列方程:
(1)2x2-3x=2
(2)(x-1)2+2x(x-1)=0.
(1)2x2-3x=2
2x2-3x-2=0
(x-2)(2x+1)=0,
解得:x1=2,x2=-
;1 2
(2)(x-1)2+2x(x-1)=0
(x-1)[(x-1)+2x]=0
(x-1)(3x-1)=0,
解得:x1=1,x2=
.1 3