因式分解:x^2+2xy+y^2-4x-4y+4.
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因式分解:x^2+2xy+y^2-4x-4y+4.
因式分解:x^2+2xy+y^2-4x-4y+4.
因式分解:x^2+2xy+y^2-4x-4y+4.
x²+2xy+y²-4x-4y+4
=(x+y)²-4(x+y)+2²
=(x+y-2)²
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