вычеслитепомогите пожалуйста! дам 15 баллов

1)  0,75                                                2) 0,25

1 - 1/2 = 1/2                                    2 - 3/4 = 1,25
1 : 1/2 = 2                                       1 : 1,25 = 0,8
2 + 2 = 4                                         4 - 0,8 = 3,2
3 - 3/4 = 2,25                                  4 : 3,2 = 1,25
9 : 2,25 = 4                                     6 - 1,25 = 4,75
4 + 4 = 8                                        19 : 4,75 = 4 
6 : 8 = 3/4 = 0,75                            8 - 4 = 4
                                                        1 : 4 = 0,25