ya ... right answer is
7 L# b% k5 M1 q3 }- O8 m# Ya)$60-$55=賺左$5& z2 y0 k1 b3 b5 m, P& W9 g
tvb now,tvbnow,bttvb7 a9 r- T/ m$ E
b)$60-$62=花多左$2tvb now,tvbnow,bttvb6 O/ R. u/ U) ^: @ o
* R, g G7 l0 A4 T8 g( ] j' ?tvb now,tvbnow,bttvbc)$68-$62=賺左$6
- z# F8 d# M7 r
' I, W! Q3 {7 O* v所以:$5-$2+$6=$9 |