计算:(x²-2xy+y²)-2(x²+2xy+y²)
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计算:(x²-2xy+y²)-2(x²+2xy+y²)
计算:(x²-2xy+y²)-2(x²+2xy+y²)
计算:(x²-2xy+y²)-2(x²+2xy+y²)
(x²-2xy+y²)-2(x²+2xy+y²)
=-x²-6xy-y²
计算:(x²-2xy+y²)-2(x²+2xy+y²)
计算:(x²-2xy+y²)-2(x²+2xy+y²)
计算:(x²-2xy+y²)-2(x²+2xy+y²)
(x²-2xy+y²)-2(x²+2xy+y²)
=-x²-6xy-y²