用因式分解法解下列方程: (1)(x+3)^2=2x+6 (2)3x^2-6x=-3 (3)9(x-2)^2-4(x+1)^2=0

2024-11-30 05:03:57
推荐回答(2个)
回答1:

1题
(x+3)²=2(x+3)
(x+3)(x+1)=0
x=-3或 -1
2题
3x²-6x+3=0
3(x-1)(x-1)=0
x=1
3题
9(x-2)²-4(x+1)²=0
(3x-6)²-(2x+2)²=0
(5x-4)(x-8)=0
x=4/5或 8

回答2:

1) )(x+3)^2-2(x+3)=(x+3)(x+3-2)=0
2) 3x^2-6x+3=0,x^2-2x+1=(x-1)^2=0
3) [ 3(x-2)]^2-[2(x+1)]^2=0, ( 3x-6+2x+2)(3x-6-2x-2)=(5x-4)(x-8)=0