Подайте у вигляді дробу вираз: а)((2х+4)/(х-3))*((3х-9)/(5х+10));
б)(((х-5)²)/(х+7)):((2х-10)/(3х+21));
в)((х)/(х³-9))+((2)/(х+3));
г)((а)/(а-2))-((2а)/(6а-12)).
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