作者: moody (你名何等尊貴榮耀) 看板: Grain
標題: math magic
時間: Thu Sep  9 00:10:57 1999

        12345679 *  9 = 111,111,111
        12345679 * 18 = 222,222,222
        12345679 * 27 = 333,333,333
        12345679 * 36 = 444,444,444
        12345679 * 45 = 555,555,555
        12345679 * 54 = 666,666,666
        12345679 * 63 = 777,777,777
        12345679 * 72 = 888,888,888
        12345679 * 81 = 999,999,999

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

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        0 * 9 +  1 = 1
        1 * 9 +  2 = 11
       12 * 9 +  3 = 111
      123 * 9 +  4 = 1111
     1234 * 9 +  5 = 11111
    12345 * 9 +  6 = 111111
   123456 * 9 +  7 = 1111111
  1234567 * 9 +  8 = 11111111
 12345678 * 9 +  9 = 111111111
123456789 * 9 + 10 = 1111111111

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

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