
因式分解:(x+y)²+4(x-y)²-4(x²-y²)
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(x+y)²+4(x-y)²-4(x²-y²)
=(x+y)²-2×(x+y)(x-y)+[2(x-y)]²
=[(x+y)-2(x-y)]²
=(x+y-2x+2y)²
=(x-3y)²
=(x+y)²-2×(x+y)(x-y)+[2(x-y)]²
=[(x+y)-2(x-y)]²
=(x+y-2x+2y)²
=(x-3y)²
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