因式分解 (x²+y²-a²)²-4x²y²(x²+y²-a²)-4x²y²
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因式分解(x²+y²-a²)²-4x²y²(x²+y²-a²)-4x²y²因式分解(x&s
因式分解 (x²+y²-a²)²-4x²y²(x²+y²-a²)-4x²y²
因式分解 (x²+y²-a²)²-4x²y²
(x²+y²-a²)-4x²y²
因式分解 (x²+y²-a²)²-4x²y²(x²+y²-a²)-4x²y²
(x²+y²-a²)²-4x²y²
=(x²+y²-a²+2xy)(x²+y²-a²-2xy)
=[(x+y)²-a²][(x-y)²-a²]
=(x+y+a)(x+y-a)(x-y+a)(x-y-a)
答:利用平方差公式
(x²+y²-a²)-4x²y²
=(x²+y²-a²-2xy)(x²+y²-a²+2xy)
=[(x-y)²-a²]*[(x+y)²-a²]
=(x-y-a)(x-y+a)(x+y-a)(x+y+a)
(x²+y²-a²)²-4x²y²
=(x²+y²-a²+2xy)(x²+y²-a²-2xy)
=[(x+y)²-a²][(x-y)²-a²]
=(x+y+a)(x+y-a)(x-y+a)(x-y-a)
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