(x-y)(x-y-4)+4 因式分解

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

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

=(X—y)平方—4(X—Y)+4=(X—Y—2)的平方