计算: [(x+y)^2n]^4/(-x-y)^(2n)
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计算: [(x+y)^2n]^4/(-x-y)^(2n)
计算: [(x+y)^2n]^4/(-x-y)^(2n)
计算: [(x+y)^2n]^4/(-x-y)^(2n)
[(x+y)^2n]^4/(-x-y)^(2n)
=[(x+y)^2n]^4/(x+y)^(2n)
=(x+y)^(8n)/(x+y)^(2n)
=(x+y)^4
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