(3у-5)*(-2у)=3у*(-2у)-5*(-2у)=-6у^2+10y
4а(а-3b)+12ab=4а*а+4а*(-3b)+12ab=4a^2-12ab+12ab=4a^2
(3у-5)·(-2у)=-2у(3у-5)=-6у²+10y
4а(а-3b)+12ab=4a²-12ab+12ab=4a²+(-12ab+12ab)=4a²
