（m-n)的2次方×（-m+3n）的3次方等于多少
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(m-n)^2×(-m+3n)^3
=(m^2-2mn+n^2)×(-m^3+9m^2n-27mn^2+27n^3)
=-m^5+9m^4n-27m^3n^2+27m^2n^3+2m^4n-18m^3n^2+54m^2n^3-54mn^4-m^3n^2+9m^2n^3-27mn^4+27n^5
=-m^5+11m^4n-46m^3n^2+90m^2n^3-81mn^4+27n^5
=(m^2-2mn+n^2)×(-m^3+9m^2n-27mn^2+27n^3)
=-m^5+9m^4n-27m^3n^2+27m^2n^3+2m^4n-18m^3n^2+54m^2n^3-54mn^4-m^3n^2+9m^2n^3-27mn^4+27n^5
=-m^5+11m^4n-46m^3n^2+90m^2n^3-81mn^4+27n^5
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