1-m方-n方 2mn 和4x方-y方 2x-y 因式分解

1-m²-n²+2mn
=1-(m-n)²
=﹙1 m-n)(1-m n)
4x²-y²+2x-y
=﹙2x+y﹚﹙2x-y﹚+﹙2x-y﹚
=﹙2x-y﹚﹙2x+y+1﹚

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