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;

问题描述:

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;
x^2-2ax+a^2=x-a[X为未知数]

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)=0x1=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)=0x1=-1/3,x2=3x^2-8x-9=0;(x+1)(x-9)=...