因式分解（x+y)²-4(x+y-1)

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因式分解（x+y)²-4(x+y-1)因式分解（x+y)²-4(x+y-1)因式分解（x+y)²-4(x+y-1)解(x+y)²-4(x+y-1)=(x+y)&

因式分解（x+y)²-4(x+y-1)
因式分解（x+y)²-4(x+y-1)

因式分解（x+y)²-4(x+y-1)
解
(x+y)²-4(x+y-1)
=(x+y)²-4(x+y)+4
=[(x+y)-2]²
=(x+y-2)²

（x+y）²-4（x+y-1）
=(x+y)²-4(x+y)+4
=(x+y-2)²

原式=（x+y)²-4(x+y）+4 = (x+y-2)²

（x+y)²-4(x+y-1)
=（x+y)²-4(x+y)+4
=[(x+y)-2]²
=(x+y-2)²