Помогите пожалуйста!!!!! Умоляю!!!!!!!! Срочно!!!! В числителе: 4,2÷6-3 целых, 1/3 ×0,3,...

1) $\frac{4,2:6-3\frac13*0.3}{7.5:0.5} =\frac{4\frac15:6-3\frac13*\frac3{10}}{7\frac12:\frac12} =\frac{\frac{21}5:6-\frac{10}3*\frac3{10}}{\frac{15}2:\frac12} =\frac{\frac{21}5*\frac16-\frac{10}3*\frac3{10}}{\frac{15}2*\frac21} = \frac{\frac75*\frac12-1}{15} =\\ \\= \frac{\frac7{10}-\frac{10}{10}}{15}=\frac{\frac{-3}{10}}{15}=-\frac{3}{10} *\frac1{15}=-\frac1{50}=-0.02\\$

2) $((7.8:0.3-3^3)+3.1):0.7=((7\frac45:\frac3{10}-27)+\frac{31}{10}):\frac7{10}=\\=((\frac{39}5*\frac{10}3-27)+\frac{31}{10}):\frac7{10}=((26-27)+\frac{31}{10}):\frac7{10}=\\=(-1+\frac{31}{10})*\frac{10}7=\frac{-10+31}{10}*\frac{10}7=\frac{21}{10}*\frac{10}7=3$