pure math
* B- G8 m# l& }tvb now,tvbnow,bttvb公仔箱論壇8 Q. D' m- g _" L) x' u7 F* J; F
[250(80x+1)+2y-250]/2 = (250*80x+2y)/2 = (2000x+2y)/2 = 1000x+y; i# A* @0 c7 M5 [$ r
tvb now,tvbnow,bttvb6 i$ r& a3 \6 C3 d
if x = 111 y = 2222, you number is 111-2222 |