2xy-x2+4-y2因式分解要求写出分解步骤

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2xy-x2+4-y2因式分解要求写出分解步骤2xy-x2+4-y2因式分解要求写出分解步骤2xy-x2+4-y2因式分解要求写出分解步骤(-x²+2xy-y²)+4=[-(x-y

2xy-x2+4-y2因式分解要求写出分解步骤
2xy-x2+4-y2因式分解
要求写出分解步骤

2xy-x2+4-y2因式分解要求写出分解步骤
(-x²+2xy-y²)+4
=[-(x-y)²]-2²
=(x-y+2)(x-y-2)