Вычислите устно:
а) $\snippet{name: op_column_rows, args: ['8 - 70', '- 19', ': 3', '* (-2)'], solution: '?'}$;
б) $\snippet{name: op_column_rows, args: ['-19 + 100', ': (-3)', '- 13', '+ 6'], solution: '?'}$;
в) $\snippet{name: op_column_rows, args: ['-18 - 46', ': 16', '- 77', ': (-3)'], solution: '?'}$;
г) $\snippet{name: op_column_rows, args: ['-15 * 6', ': 9', '* (-13)', '- 260'], solution: '?'}$.