真是太厉害了！数学是科学之母

burroughs · 发表于 2006-2-16 16:51:25

3 x 37 = 111
   6 x 37 = 222
   9 x 37 = 333
12 x 37 = 444
15 x 37 = 555
18 x 37 = 666
21 x 37 = 777
24 x 37 = 888
27 x 37 = 999

  Nice one:

  111.111.111  x  111.111.111 = 12.345.678.987.654.321

  Trapeze:

                        1 x 9 + 2 = 11
                        12 x 9 + 3 = 111
                     123 x 9 + 4 = 1111
                  1234 x 9 + 5 = 11111
                  12345 x 9 + 6 = 111111
               123456 x 9 + 7 = 1111111
            1234567 x 9 + 8 = 11111111
            12345678 x 9 + 9 = 111111111

another Trapeze:

                        1 x 8 + 1 = 9
                        12 x 8 + 2 = 98
                     123 x 8 + 3 = 987
                  1234 x 8 + 4 = 9876
                  12345 x 8 + 5 = 98765
               123456 x 8 + 6 = 987654
            1234567 x 8 + 7 = 9876543
            12345678 x 8 + 8 = 98765432
         123456789 x 8 + 9 = 987654321

and another one:

                                 0 x 9 + 8 = 8
                              9 x 9 + 7 = 88
                              98 x 9 + 6 = 888
                           987 x 9 + 5 = 8888
                        9876 x 9 + 4 = 88888
                        98765 x 9 + 3 = 888888
                     987654 x 9 + 2 = 8888888
                  9876543 x 9 + 1 = 88888888
                  98765432 x 9 + 0 = 888888888
               987654321 x 9 - 1  = 8888888888
            9876543210 x 9 - 2  = 88888888888

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