Đặt tính rồi tính

 a) 457,75   +    109,18                                                b) 1142,45 - 674,18

..................................................                                  .............................................

..........................................                               ..............................................

..........................................                                ............................................

c) 240,6   ×    3,5                                                    d)   17,55   :   3,9

..................................................                                  .............................................

..................................................                                  .............................................

..................................................                             ..... ..............................................................                                 

...........................................                            .............................................

...........................................                            ..............................................