Ответ:\(\frac{0.3\cdot4.4}{0.8}=\frac{1.32}{0.8}=1.65\).\(5.4\cdot0.8+0.08=4.32+0.08=4.4\).\(1.4\cdot2.4+0.24=3.36+0.24=3.6\).\(2.5\cdot3.5-0.35=8.75-0.35=8.4\).\(2.1\cdot9.6=20.16\).\(16.5:1=16.5\).\(7.7\cdot5.3=40.81\).