Вычислите устно:
а) $\snippet{name: op_column_rows, args: ['60 - 36', '* 3', ': 4', '+ 27', ': 3'], solution: '?'}$;
б) $\snippet{name: op_column_rows, args: ['55 + 25', ': 5', '+ 7', '* 3', '+ 31'], solution: '?'}$;
в) $\snippet{name: op_column_rows, args: ['75 : 25', '* 15', ': 9', '* 12', '+ 240'], solution: '?'}$;
г) $\snippet{name: op_column_rows, args: ['15 * 6', '- 39', ' : 17', '* 18', '+ 46'], solution: '?'}$;
д) $\snippet{name: op_column_rows, args: ['45 + 30', ': 15', '* 20', '- 34', ': 11'], solution: '?'}$.