Вычислите устно:
а) $\snippet{name: op_column_rows, args: ['83 - 39', ': 4', '* 7', '+ 23'], solution: '?'}$;
б) $\snippet{name: op_column_rows, args: ['94 - 19', ': 25', '* 15', '+ 55'], solution: '?'}$;
в) $\snippet{name: op_column_rows, args: ['47 + 25', ': 18', '* 12', '- 19'], solution: '?'}$;
г) $\snippet{name: op_column_rows, args: ['71 + 19', ': 15', '* 13', '- 28'], solution: '?'}$;
д) $\snippet{name: op_column_rows, args: ['46 + 18', ': 16', '* 25', '- 50'], solution: '?'}$.