Вычислите устно:
а) $\snippet{name: op_column_rows, args: ['400 : 25', '* 5', '+ 40', ': 12', '+ 190'], solution: '?'}$;
б) $\snippet{name: op_column_rows, args: ['700 - 20', ': 4', '* 2', ': 17', '+ 480'], solution: '?'}$;
в) $\snippet{name: op_column_rows, args: ['420 : 14', '* 6', '+ 120', ': 25', '* 8'], solution: '?'}$;
г) $\snippet{name: op_column_rows, args: ['320 + 240', ': 80', '* 50', '- 60', ': 29'], solution: '?'}$.