ya ... right answer is 9 h5 ^' u# V, g4 I+ k8 x2 k. i 
a)$60-$55=賺左$5公仔箱論壇; S" T- K# Y" H 
- J; L+ l" N- Z. ` 
b)$60-$62=花多左$2 
1 Q( i9 q1 Z& n; z7 v- `0 o5.39.217.77:8898% ?6 P) o. v# Z/ S9 p 
c)$68-$62=賺左$6 
$ y0 d+ a" K% \% }, H) \& mtvb now,tvbnow,bttvb  y: A) n) m) I! r( d1 L# }7 I 
所以:$5-$2+$6=$9 |