ya ... right answer is
/ Z% h* x; z( L" g$ _" |a)$60-$55=賺左$5
( S* W( b* @; H; k0 M$ y2 S; B. s5 x/ g0 }0 a: J
b)$60-$62=花多左$2tvb now,tvbnow,bttvb/ I/ R! T% q5 ?9 B
( X, ?) {' ?" G, t- A- h7 l; dc)$68-$62=賺左$6
9 D( j8 z- O' u$ |0 Stvb now,tvbnow,bttvbtvb now,tvbnow,bttvb: J( J5 l; e5 b: u
所以:$5-$2+$6=$9 |