Question

adiciones
a) 5 sobre 28 + 3 sobre 14 + 7 sobre 12 =
b) 3 sobre 26 + 1 sobre 13 + 5 sobre 6=

Answer 1

a)
5/28 + 3/14 + 7/12 =                        28     14     12      2
15/84 + 18/84 + 49/84 =                  14       7       6      2
82/84 = 41/42                                    7       7       3      3
                                                          7       7       1      7
                                                          1       1       1
                                                          2 X 2 X 3 X 7 = 84

b)   
3/26 + 1/13 + 5/6 =                            26     13     6     2
9/78 + 6/78 + 65/78 =                        13     13     3     3        
80/78 = 40/39                                    13     13     1    13
                                                            1       1     1
                                                           2 X 3 X13 = 78