ya ... right answer is
' d# O4 d! h0 \tvb now,tvbnow,bttvba)$60-$55=賺左$5
& _3 L: o J6 K2 H# h5 Btvb now,tvbnow,bttvb公仔箱論壇. |* a+ d5 z1 o' b$ k
b)$60-$62=花多左$2公仔箱論壇0 W. O# |9 w' w: o+ I% t0 G- t( B
3 ]$ k4 j6 U: G/ G% v, |公仔箱論壇c)$68-$62=賺左$6
. E5 B2 p W6 l: L
, S0 g" C- x3 O* O m' k& b公仔箱論壇所以:$5-$2+$6=$9 |