a³·(-ab³)³= (-x³y³)(7xy²-9x²y)=a³·(-ab³)³= (-x³y³)(7xy²-9x²y)=

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a³·(-ab³)³= (-x³y³)(7xy²-9x²y)=a³·(-ab³)³= (-x³y³)(7xy²-9x²y)=
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a³·(-ab³)³= (-x³y³)(7xy²-9x²y)=a³·(-ab³)³= (-x³y³)(7xy²-9x²y)=
a³·(-ab³)³= (-x³y³)(7xy²-9x²y)=
a³·(-ab³)³=
(-x³y³)(7xy²-9x²y)=

a³·(-ab³)³= (-x³y³)(7xy²-9x²y)=a³·(-ab³)³= (-x³y³)(7xy²-9x²y)=
a^3*(-ab^3)^3
=a^3*(-a)^3*(b^9)
=-a^6*b^9
(-x^3y^3)(7xy^2-9x^2y)
=-(xy)^3*xy*(7y-9x)
=-(xy)^4*(7y-9x)
=9x^5y^4-7x^4y^5