Вычислите устно:
а) $\snippet{name: op_column_rows, args: ['100 - 55', '* 2', ': 18', '* 15'], solution: '?'}$;
б) $\snippet{name: op_column_rows, args: ['90 - 71', '* 3', '+ 23', ': 16'], solution: '?'}$;
в) $\snippet{name: op_column_rows, args: ['100 - 54', ': 23', '* 19', '+ 22'], solution: '?'}$;
г) $\snippet{name: op_column_rows, args: ['100 - 13', ': 3', '+ 27', ': 14'], solution: '?'}$.