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：(x&

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