ya ... right answer is 5.39.217.77% O. k2 y9 T V$ S+ q9 h) v! r& J
a)$60-$55=賺左$5
# f, V, D( h! x, |5.39.217.77
/ H, ]8 o" D4 h, v/ p( t- W) hb)$60-$62=花多左$20 b7 i1 Q7 I9 \* @- z
2 b$ p$ Y9 {3 h6 ~2 jc)$68-$62=賺左$6
6 Y" J4 g4 b2 q, Ftvb now,tvbnow,bttvbtvb now,tvbnow,bttvb- G7 f F( b3 `3 S- E
所以:$5-$2+$6=$9 |