x2-2xy+y2-4分解因式

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x2-2xy+y2-4分解因式
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x2-2xy+y2-4分解因式
x2-2xy+y2-4分解因式

x2-2xy+y2-4分解因式
x²-2xy+y²-4
=(x²-2xy+y²)-4
=(x-y)²-4
=[(x-y)+2][(x-y)-2]
=(x-y+2)(x-y-2)

x2-2xy+y2-4
=(x-y-2)(x-y+2)

x2-2xy+y2-4
=﹙x²-2xy+y²﹚﹣4
=﹙x-y﹚²-4
=﹙x-y+2﹚﹙x-y-2﹚

(x-y)2-22=(x-y+2)(x-y-2)

认为不错 给好评啊