怎么计算(x-y)^m*(x-y)^(n+2)*(y-x)^3

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怎么计算(x-y)^m*(x-y)^(n+2)*(y-x)^3怎么计算(x-y)^m*(x-y)^(n+2)*(y-x)^3怎么计算(x-y)^m*(x-y)^(n+2)*(y-x)^3(x-y)^m

怎么计算(x-y)^m*(x-y)^(n+2)*(y-x)^3
怎么计算(x-y)^m*(x-y)^(n+2)*(y-x)^3

怎么计算(x-y)^m*(x-y)^(n+2)*(y-x)^3
(x-y)^m*(x-y)^(n+2)*[-(x-y)]^3
=-[(x-y)^m*(x-y)^(n+2)*(x-y)^3]
=-(x-y)^(m+n+2+3)
=-(x-y)^(m+n+5)