用因式分解法解下列方程:(1)(4x-1)(5x+7)=0.(2)3x(x-1)=2-2x.(3)(2x+3) 2 =4(2x+3).

用因式分解法解下列方程:(1)(4x-1)(5x+7)=0.(2)3x(x-1)=2-2x.(3)(2x+3) 2 =4(2x+3).(4)2(x-3) 2 =x 2 -9.

(1))(4x-1)(5x+7)=0,
4x-1=0,5x+7=0,
x 1 =
1
4
,x 2 =-
7
5


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


(3)(2x+3) 2 =4(2x+3),
(2x+3) 2 -4(2x+3)=0,
(2x+3)(2x+3-4)=0,
2x+3=0,2x+3-4=0,
x 1 =-
3
2
,x 2 =
1
2


(4)2(x-3) 2 =x 2 -9,
2(x-3) 2 -(x+3)(x-3)=0,
(x-3)[2(x-3)-(x+3)]=0,
x-3=0,2(x-3)-(x+3)=0,
x 1 =3,x 2 =9.
温馨提示:内容为网友见解,仅供参考
无其他回答
相似回答
大家正在搜