Ответ:\(5 \cdot 2 = \mathbf{10}\).\(10 : \mathbf{5} = 2\).\(7 \cdot 3 = \mathbf{21}\).\(\mathbf{21} : 3 = 7\).\(3 \cdot 9 = \mathbf{27}\).\(\mathbf{27} : 9 = 3\).Ответ: 10; 5; 21; 21; 27; 27.