Page 93 - บทที่ 1
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             ' 7
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                                   _
                                                                                                       4 + 7 =
                                         13
                               8
                                                                       6 X 5
                           —
                                                                                                       9x8 =
                                      9 X 7
                                                                        8 + 7
                           —
                                       7
                                   + 7
                                                                          10 - 5
                                                                                                       9 - 2 =
                                       7
                                                                                                       3 + 8 =
                                   X 6
                                                                        2 + 5
                                   —
                           —
                                         10
                               9
                                                                                                          13 - 9 =
                                                                       7 X 0
                           —
                                       2 X 3
                                                                                                       5x7 =
                                                                        2 + 8
                                   —
                           —
                               5
                                                                                                       9 + 5 =
                                       7
                                                                       4 X 9
                           —
                                   + 4
                                                                                                       5 + 4 =
                                       3
                                                                          11 - 2
                           —
                                       8 X 9
                                                                                                       3x8 =
                                                                       4 x6
                           —
                                                                                                       7x3 =
                                       4
                                   + 6
                                                                        9 - 7
                                   —
                           —
                                                                                                          13 - 5 =
                                8
                                         15
                                                                        7 + 6
                           —
                                                                                                        4 + 4 =
                                       8 X 5
                                                                       5 X 9
                                   —
                           —
                                3
                                       6
                                                                                                        8 - 7 =
                                                                        7 + 2
                           —
                                   + 7
                                                                                                       7x7 =
                                                                          18 - 9
                                       3
                           —
                                                                                                        5 + 0 =
                                       6
                                                                        5 - 3
                                   + 1
                                   —
                           —
                                                                                                          10 - 6 =
                                                                        9 + 9
                                9
                                       9
                                   —
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                                         13
                                                                                          uivi
                                                                        2 X 5
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