Answer :

Lilith
[tex]-3x^2y * (5xy^2 +xy) =\\ \\= -3x^2y \cdot 5xy^2 -3x^2y\cdot xy =\\ \\=-3\cdot 5x ^{2+1}y^{1+2} -3x ^{2+1}y ^{1+1}=\\ \\ =-15x ^{3}y^{3} -3x ^{3}y ^{2}[/tex]


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