用因式分解法解下列方程:2(5x-1)^2=3(1-5x); (2x-1)^2-x^2-4x-4=0; x^2-8x-9=0;
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2(5x-1)^2=3(1-5x);
2(5x-1)^2+3(5x-1)=0
(5x-1)(10x-2+3)=0
(5x-1)(10x+1)=0
x1=1/5,x2=-1/10
(2x-1)^2-x^2-4x-4=0
(2x-1)²-(x+2)²=0
(2x-1+x+2)(2x-1-x-2)=0
(3x+1)(x-3)=0
x1=-1/3,x2=3
x^2-8x-9=0;
(x+1)(x-9)=0
x1=-1,x2=9
x^2-2ax+a^2=x-a
(x-a)²-(x-a)=0
(x-a)(x-a-1)=0
x1=a, x2=a+1
2(5x-1)^2+3(5x-1)=0
(5x-1)(10x-2+3)=0
(5x-1)(10x+1)=0
x1=1/5,x2=-1/10
(2x-1)^2-x^2-4x-4=0
(2x-1)²-(x+2)²=0
(2x-1+x+2)(2x-1-x-2)=0
(3x+1)(x-3)=0
x1=-1/3,x2=3
x^2-8x-9=0;
(x+1)(x-9)=0
x1=-1,x2=9
x^2-2ax+a^2=x-a
(x-a)²-(x-a)=0
(x-a)(x-a-1)=0
x1=a, x2=a+1
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