[-3(x-y)^3]^2•（y-x)^3

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[-3(x-y)^3]^2•（y-x)^3[-3(x-y)^3]^2•（y-x)^3[-3(x-y)^3]^2•（y-x)^3[-3(x-y)^3]^2•

[-3(x-y)^3]^2•（y-x)^3
[-3(x-y)^3]^2•（y-x)^3

[-3(x-y)^3]^2•（y-x)^3
[-3(x-y)^3]^2•（y-x)^3
=[9(x-y)^6]*[-(x-y)^3]
=-9(x-y)^9

：[-3(x-y)^3]^2•（y-x)^3 =-9(x-y)^6*(x-y)^3=-9(x-y)^9