Ответ:\(45.6 \cdot 3.7 = 168.72\).\(128.4 : 12 = 10.7\).\(7.25 + 3.86 - 1.9 = 11.11 - 1.9 = 9.21\).Ответ: 1) 168,72; 2) 10,7; 3) 9,21.