Дам 30 баллов! Выполните действия:
а) (3ав+5а-в)-(12ав-3а)
б) -(7х+9)+5ух-5у(-х-2)+9
в) 2х(в квадрате)(3-5х) 5х в кубе*
г) 2а(а+в-с)-2в(а-в-с)+2с(а-в+с)
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