Представьте в виде многочлена а) 4а(5а-2)+7(3а-4)=? б) -2b(b-4) +3b(-2b+7)=?
в) 3х(х-1) - 5х(х-2)=?
г) 2а(а-7)-3а(а+2)+6(а^2-3)=?​
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