А) −4,5 ⋅ 1,8 = −8,1
Б) −3\(\frac{5}{9}\) ⋅ (−2\(\frac{1}{4}\)) = −\(\frac{32}{9}\) ⋅ (−\(\frac{9}{4}\)) = \(\frac{32}{9}\) ⋅ \(\frac{9}{4}\) = \(\frac{32}{4}\) = 8
В) −30,6 : (−0,6) = 30,6 : 0,6 = 51
Г) −31,68 : 16 = −1,98
Ответ: А) -8,1; Б) 8; В) 51; Г) -1,98