3.Выполните действия:а) 4p-q / 12p^2q + p-5q / 15pq^2; в) m-3n / 8n(m+n) - m+3n / m+3n / 8n(m-n) ; 
б) x^2-x+1-x^3 / x+1 ; г) 3c+7 / c^2+7c + c-7 / 7c + 49 .
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