8 不見了


                                                        1=        1
           1×9+
=       10
          11×9+
=      100
         111×9+
=     1000
        1111×9+
=    10000
       11111×9+
=   100000
      111111×9+
=  1000000
     1111111×9+
= 10000000
 +)
 11111111×9+=100000000
    12345678×9+
=111111111


           ( 12345678+
1) ×9=111111111

                     12345679
×9=111111111

 

                                                                          因此 , 12345679 ×9× N N N N N N N N N N

                                         
其中 N=1

由另一方面看,因為1÷81=0.012345679,可知(1÷81)×90.1,(1÷81)×9×20.2,.....,(1÷81)×9×90.91


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