ya ... right answer is  
6 ?, s- ?" q7 c' ja)$60-$55=賺左$55.39.217.77:8898* ~$ S0 O& k+ P9 w 
 
# M; d6 m" e. F. c  j7 z, Utvb now,tvbnow,bttvbb)$60-$62=花多左$25.39.217.77:8898* p" B' P) o$ d* W2 |8 F, V5 { 
5.39.217.77:88981 B6 X# O$ d& w2 | 
c)$68-$62=賺左$6 
& E5 l7 C: X7 `3 e- p5 B' ntvb now,tvbnow,bttvb 
+ J+ I/ |; Y3 Mtvb now,tvbnow,bttvb所以:$5-$2+$6=$9 |