因式分解因式分解9(x-y)²(x+y)+3(x+y)²(y-x)
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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)](/uploads/image/z/18149445-45-5.jpg?t=%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A39%28x-y%29%26%23178%3B%28x%2By%29%2B3%28x%2By%29%26%23178%3B%28y-x%29)
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)
=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)