因式分解27-8(x+y)³,
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因式分解27-8(x+y)³,
27-8(x+y)³
=3³-[2(x+y)]³
=[3-2(x+y)]{3²+3×2(x+y)+[2(x+y)]²}
=(3-2x-2y)(9+6x+6y+4x²+4xy+4y²)
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因式分解27-8(x+y)³,
27-8(x+y)³
=3³-[2(x+y)]³
=[3-2(x+y)]{3²+3×2(x+y)+[2(x+y)]²}
=(3-2x-2y)(9+6x+6y+4x²+4xy+4y²)
收起