Вычислите устно:
а) $\snippet{name: op_column_rows, args: ['55 - 47', '* 9', '- 34', ': 19', '* 24'], solution: '?'}$;
б) $\snippet{name: op_column_rows, args: ['75 - 66', '* 9', '- 27', '+ 18', ': 18'], solution: '?'}$;
в) $\snippet{name: op_column_rows, args: ['84 - 78', '* 8', '+ 12', ': 5', '* 30'], solution: '?'}$;
г) $\snippet{name: op_column_rows, args: ['91 : 13', '* 80', '+ 240', '- 500', ': 15'], solution: '?'}$;
д) $\snippet{name: op_column_rows, args: ['98 : 14', '* 70', '+ 210', ': 35', '* 15'], solution: '?'}$.