=[3(x-y)]^2+12(x-y)+2^2
=[3(x-y)+2]^2
=(3x-3y+2)^2
4+12（x-y）+9（x-y）^2
=[3(x-y)]^2+12(x-y)+2^2
=[3(x-y)+2]^2
=(3x-3y+2)^2
这样可以么？
![因式分解：（步骤）4+12（x-y）+9（x-y）平方=谢谢4+12（x-y）+9（x-y）^2=[3(x-y)]^2+](/img/130523294.jpg)
因式分解：（步骤）4+12（x-y）+9（x-y）平方=谢谢4+12（x-y）+9（x-y）^2=[3(x-y)]^2+
4+12（x-y）+9（x-y）^2
=[3(x-y)]^2+12(x-y)+2^2
=[3(x-y)+2]^2
=(3x-3y+2)^2
4+12（x-y）+9（x-y）^2
=[3(x-y)]^2+12(x-y)+2^2
=[3(x-y)+2]^2
=(3x-3y+2)^2
这样可以么？
=[3(x-y)]^2+12(x-y)+2^2
=[3(x-y)+2]^2
=(3x-3y+2)^2
4+12（x-y）+9（x-y）^2
=[3(x-y)]^2+12(x-y)+2^2
=[3(x-y)+2]^2
=(3x-3y+2)^2
这样可以么？