分解因式:(x-y)²-6x+6y+9=?

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分解因式:(x-y)²-6x+6y+9=?分解因式:(x-y)²-6x+6y+9=?分解因式:(x-y)²-6x+6y+9=?(x-y)²-6x+6y+9=(x

分解因式:(x-y)²-6x+6y+9=?
分解因式:(x-y)²-6x+6y+9=?

分解因式:(x-y)²-6x+6y+9=?
(x-y)²-6x+6y+9
=(x-y)²-6(x-y)+9
=(x-y)²-6(x-y)+3²
=(x-y-3)²