(x+y)²-2(x²-y²)+(x-y)²,提取公因式
4个回答
(x+y)²-2(x²-y²)+(x-y)²
=(x+y)²-2(x+y)(x-y)+(x-y)²
=[(x+y)-(x-y)]²
=﹙x+y-x+y﹚²
=4y²
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