数学之美，今天才知道。

数学之美，今天才知道。

                         1x8+1=9
                       12x8+2=98
                     123x8+3=987
                   1234x8+4=9876   
                 12345x8+5=98765
               123456x8+6=987654
             1234567x8+7=9876543
           12345678x8+8=98765432
         123456789x8+9=987654321
                         1x9+2=11
                       12x9+3=111
                     123x9+4=1111
                   1234x9+5=11111
                 12345x9+6=111111
               123456x9+7=1111111
             1234567x9+8=11111111
           12345678x9+9=111111111
       123456789x9+10=1111111111
                         9x9+7=88
                       98x9+6=888
                     987x9+5=8888
                   9876x9+4=88888
                 98765x9+3=888888
               987654x9+2=8888888
             9876543x9+1=88888888
           98765432x9+0=888888888
                  很炫，是不是?
             再看看这个对称式
                         1x1=1
                     11x11=121
                 111x111=12321
             1111x1111=1234321
         11111x11111=123454321
     111111x111111=12345654321
1111111x1111111=1234567654321
               11111111x11111111=
                 123456787654321
              111111111x111111111=
                12345678987654321数学之美，今天才知道。