Вычислите устно:
а) $\snippet{name: op_column_rows, args: ['39 : 3', '+ 37', ': 5', '* 11', ': 55'], solution: '?'}$;
б) $\snippet{name: op_column_rows, args: ['28 : 2', '+ 40', ': 3', '* 5', ': 15'], solution: '?'}$;
в) $\snippet{name: op_column_rows, args: ['72 : 3', ': 12', '+ 44', ': 23', '* 35'], solution: '?'}$;
г) $\snippet{name: op_column_rows, args: ['80 : 20', '* 15', ': 30', '+ 19', '* 5'], solution: '?'}$;
д) $\snippet{name: op_column_rows, args: ['100 : 10', '* 7', ': 14', '* 25', '- 75'], solution: '?'}$.