ya ... right answer is
, g* N0 W, d& M! w- Aa)$60-$55=賺左$5tvb now,tvbnow,bttvb4 W# A8 |8 M% a5 Q; S! ~
7 S: H. K# O. d3 ltvb now,tvbnow,bttvbb)$60-$62=花多左$2
9 _$ h7 c4 o# m$ a* v9 I+ j: N1 G& H$ D9 Z% Y6 ]8 P/ i
c)$68-$62=賺左$6
, K0 Y& V' G$ utvb now,tvbnow,bttvb$ v6 V n) g8 n2 g
所以:$5-$2+$6=$9 |