用适当的方法解下列方程:(1)2x 2 -5x-3=0(用配方法)     (2)3x(x-1)=2-2x

2025-12-17 16:00:44
推荐回答(1个)
回答1:

(1)2x 2 -5x-3=0(用配方法)         
x 2 -
5
2
x-3=0
      
(x-
5
4
) 2 =
49
16

x 1 =3, x 2 =-
1
2


(2)3x(x-1)=2-2x
∴3(x-1)+2(x-1)=0
∴(x-1)( 3x+2)=0   
x 1 =1, x 2 =-
2
3