星期一, 十一月 24, 2008

1的巧合

  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
  123456789 x 9 +10= 1111111111
 

  1 x 1 = 1
  11 x 11 = 121
  111 x 111 = 12321
  1111 x 1111 = 1234321
  11111 x 11111 = 123454321
  111111 x 111111 = 12345654321
  1111111 x 1111111 = 1234567654321
  11111111 x 11111111 = 123456787654321
  111111111 x 111111111 = 12345678987654321

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