碑个铁一样的答案你:公仔箱論壇+ a8 W/ ^/ T, L" v0 u T
假设你本身有12蚊.tvb now,tvbnow,bttvb D. N( r# n% z, T7 S- b" m
8蚊买,仲有4蚊系袋.
" j- K8 u& U% x4 I/ e3 C" w2 y0 O8 ttvb now,tvbnow,bttvb9蚊卖。又有返13蚊公仔箱論壇6 L/ R% Y5 m( i2 a7 C3 x
10蚊买,剩低3蚊,/ E* F, Y5 I, X2 W1 S
11卖,又有返14蚊系袋,公仔箱論壇6 ~0 w" h, m( K9 K+ n! h; x
14-12=2.
8 T; C; H% K# a1 F/ S铁一般的证明!!!!!!!!!!
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