原式=4(x²-2xy+y²)/[2(x²-y²)]
=2(x-y)²/(x+y)(x-y)
=2(x-y)/(x+y)
=(2x-2y)/(x+y)
原式=4(x²-2xy+y²)/[2(x²-y²)] 提取公因数
=2(x-y)²/(x+y)(x-y) 约分2分解因式
=2(x-y)/(x+y) 约分
=(2x-2y)/(x+y)
原式=4(x²-2xy+y²)/2(x²-y²)
=2(x-y)²/(x+y)(x-y)
=2(x-y)/(x+y)
完了~~~~~~~~~
给分吧
(4x²-8xy+4y²)/(2x²-2y²)=4(x²-2xy+y²)/2(x²-y²)
=4(x-y)^2/2(x+y)(x-y)=2(x-y)/(x+y)
(x-y)^2是指(x-y)的平方
原式=4(x-y)^2/2(x+y)(x-y)=2(x-y)/x+y