因式分解(x+y)²-4x²

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因式分解(x+y)²-4x²
因式分解(x+y)²-4x²

因式分解(x+y)²-4x²
(x+y)²-4x²
=(x+y+2x)(x+y-2x)
=(3x+y)(y-x)

(x+y)²-4x²
=(x+y+2x)(x+y-2x)
=(3x+y)(y-x)

(x+y+2x)(x+y-2x)
=(3x+y)(-x+y)