Ответ:\(0.6+0.4=1\);\(0.6+0.04=0.64\);\(0.6-0.4=0.2\);\(0.6-0.04=0.56\);\(0.6\cdot4=2.4\);\(0.6\cdot0.4=0.24\);\(6:4=1.5\);\(0.6:4=0.15\).