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