pure math
# D, I# y" W: T+ i: Q! q5.39.217.76
$ C* h+ p' b3 ?公仔箱論壇[250(80x+1)+2y-250]/2 = (250*80x+2y)/2 = (2000x+2y)/2 = 1000x+y6 Q) v( A7 `8 G! B, c# u
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if x = 111 y = 2222, you number is 111-2222 |