配方法分解因式的4个步骤（配方法分解因式）

1、x^2+2x-3 =x2+2x+1-4 =(x+1)2-4 =(x+1-2)(x+1+2) =(x-1)(x+3) 2x^2-7x+6 =2x2-8x+8+x-2 =2(x-2)2+x-2 =(x-2)(2x-4+1) =(x-2)(2x-3) 3x^2y^2-10xy+7 =3x2y2-3xy-7xy+7 =3xy(xy-1)-7(xy-1) =(xy-1)(3xy-7) -y^2+20y-96 =-y2+20y-100+4 =4-(y-10)2 =(2-y+10)(2+y-10) =(12-y)(y-8)。