中科新闻网傻子瓜子怎么倒闭的:分解因式!!!!!!
来源：百度文库 编辑：中科新闻网 时间：2024/05/04 03:31:29
x^2-y^2-2x+4y-3
ab(x^2+y^2)+xy(a^2+b^2)
ab(x^2+y^2)+xy(a^2+b^2)
x^2-y^2-2x+4y-3
=x^2-2x+1-(y^2-4y+4)
=(x-1)^2-(y-2)^2
=(x-1+y-2)(x-1-y+2)
=(x+y-3)(x-y+1)
x^2-y^2-2x+4y-3
=x^2-2x+1-(y^2-4y+4)
=(x-1)^2-(y-2)^2
x^2-y^2-2x+4y-3
=（x^2-2x+1）-(y^2-4y+4)
=(x-1)^2-(y-2)^2
=2{(x-1)^-(y-2)^}
=2{（x-1)+(y-2)}{(x-1)-(y-2)}
=2(x-1+y-2)(x-1-y+2)
=2(x+y-3)(x-y+1)