因式分解因式分解9(x-y)²(x+y)+3(x+y)²(y-x)

因式分解因式分解9(x-y)²(x+y)+3(x+y)²(y-x)
因式分解因式分解9(x-y)²(x+y)+3(x+y)²(y-x)

因式分解因式分解9(x-y)²(x+y)+3(x+y)²(y-x)
9(x-y)²(x+y)+3(x+y)²(y-x)
=9(x+y)(x-y)(x+y)-3(x+y)²(x-y)
=9(x+y)²(x-y)-3(x+y)²(x-y)
=6(x+y)²(x-y)

楼上的思路
但是第二不错了（x-y）^2不等于（x+y）（x-Y）