Ответ:\(3.8+2.9=6.7\).\(9.3+7.8=17.1\).\(8.4+3.7=12.1\).\(8.8+5.9=14.7\).\(\frac{4.8\cdot0.4}{0.6}=\frac{1.92}{0.6}=3.2\).\(\frac{5.6\cdot0.3}{0.8}=\frac{1.68}{0.8}=2.1\).