Вычислите устно:
а) $\snippet{name: op_column_rows, args: ['10 : 4', '- 1,3', '* 0,4', '+ 0,32'], solution: '?'}$;
б) $\snippet{name: op_column_rows, args: ['4 - 3,4', '* 1,4', '+ 0,06', ': 1,8'], solution: '?'}$;
в) $\snippet{name: op_column_rows, args: ['3 : 300', '+ 0,37', ': 1,9', '* 8'], solution: '?'}$;
г) $\snippet{name: op_column_rows, args: ['70 : 20', ': 10', '* 4', '+ 1,04'], solution: '?'}$;
д) $\snippet{name: op_column_rows, args: ['9,8 : 7', '* 3', '- 0,3', '+ 2,1'], solution: '?'}$;
е) $\snippet{name: op_column_rows, args: ['49 : 70', '+ 9,8', ': 5', ': 0,3'], solution: '?'}$;
ж) $\snippet{name: op_column_rows, args: ['3,9', '+ 2,7', ': 11', '* 13'], solution: '?'}$;
з) $\snippet{name: op_column_rows, args: ['4,6', '+ 2,2', '- 30,5', '* 0,1'], solution: '?'}$.