Ответ:\(21=3\cdot7\).\(33=3\cdot11\).\(49=7\cdot7=7^2\).\(55=5\cdot11\).Ответ: \(21=3\cdot7\), \(33=3\cdot11\), \(49=7^2\), \(55=5\cdot11\).