[(m-n)^2*(m-n)^3]^2/(m-n)^4

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[(m-n)^2*(m-n)^3]^2/(m-n)^4[(m-n)^2*(m-n)^3]^2/(m-n)^4[(m-n)^2*(m-n)^3]^2/(m-n)^4设m-n为a(a^2*a^3)^2/a

[(m-n)^2*(m-n)^3]^2/(m-n)^4
[(m-n)^2*(m-n)^3]^2/(m-n)^4

[(m-n)^2*(m-n)^3]^2/(m-n)^4
设m-n为a
(a^2* a^3)^2/a^4=a^6
即 (m-n)^6