Page 35 - Numbertheory
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                  130892 +157852                  ()

157852         1  92                     130892

130892 +157852                        . 5 52
                                     .6 1+5 = 6

        . (1+ 2 + 3 + 4 + ... +50)3               ()

          1+ 2 + 3 + ... + 50 = 50 × 51 = 25× 51   .5
                                     2
                                                  53 = 125
        (1+ 2 + 3 + ...+ 50)3

                                       .5

                                                  .

                      . 20092012                  ()

        20092     . 9 2009

. 9 1×9 = 9           20093          . 1 92 = 81

                  .1 9×9 = 81              20094

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