Вычислите устно:
а) $\snippet{name: op_column_rows, args: ['6 : 1,2', '- 5', '* 0,97', '+ 3,15'], solution: '?'}$;
б) $\snippet{name: op_column_rows, args: ['9 : 1,5', ' - 5', '* 0,25', '+ 6'], solution: '?'}$;
в) $\snippet{name: op_column_rows, args: ['3 * 1,6', ' -1,2', ': 12', '+ 1,2'], solution: '?'}$;
г) $\snippet{name: op_column_rows, args: ['0,6 * 6', '+ 1,2', ': 40', '* 50'], solution: '?'}$;
д) $\snippet{name: op_column_rows, args: ['30 * 3', '- 4,8', ': 0,7', '* 0,01'], solution: '?'}$;
е) $\snippet{name: op_column_rows, args: ['2 * 1,9', '- 2,2', ': 0,8', ': 0,1'], solution: '?'}$;
ж) $\snippet{name: op_column_rows, args: ['7 - 0,7', ': 0,9', '* 0,02', '+ 0,66'], solution: '?'}$;
з) $\snippet{name: op_column_rows, args: ['1,5 * 6', ': 5', '* 2', '+ 2,4'], solution: '?'}$.