Ответ:\(9.3+7.8=17.1\);\(5.7-7.6=-1.9\);\(5.2\cdot3.1=16.12\);\(8.2:4.1=2\).Ответ: 1) 17,1; 4) −1,9; 7) 16,12; 10) 2.