100 (10*10) /81 (9*9) =1.234567901234567901...
10000 (100*100) /9801 (99*99) = 1.020304050607080909...
1000000 / 998001 = 1.002003004005006007008009010011...
100000000 / 99980001 = 1.000200030004000500060007000800...
10000000000 / 9999800001 = 1.000020000300004000050000600007...
... 这是为什么 ...
10000 (100*100) /9801 (99*99) = 1.020304050607080909...
1000000 / 998001 = 1.002003004005006007008009010011...
100000000 / 99980001 = 1.000200030004000500060007000800...
10000000000 / 9999800001 = 1.000020000300004000050000600007...
... 这是为什么 ...










