Ответ Автор - m11m б) 6а+1 - 2а = 6а+1 - 2а = (2а+1)(2а-1) -2а-1 (2а+1)(2а-1) -(2а+1)= 6а+1 + 2а = 6а+1+2а(2а-1) = (2а+1)(2а-1) 2а+1 (2а+1)(2а-1)= 6а+1+4а² -2а = 4а² +4а+1 = (2а+1)(2а-1) (2а+1)(2а-1)= (2а+1)² = 2а+1 (2а+1)(2а-1) 2а-1