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發表於 2009-3-26 01:29 PM
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pure math
& H. E. i3 O0 p L9 I公仔箱論壇5.39.217.76' s; @7 q8 l( l' L. ?9 H0 I
[250(80x+1)+2y-250]/2 = (250*80x+2y)/2 = (2000x+2y)/2 = 1000x+y
8 p$ q1 ^1 h( I' K1 l公仔箱論壇# N6 ?# O, j d0 r( x. `8 a
if x = 111 y = 2222, you number is 111-2222 |
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