a)$60-$55=賺左$5
, i' ?8 B* E; J. D( R3 G* S0 e# W2 {" R, \ j
b)$60-$62=花多左$25.39.217.76 K& [) ?6 k0 x& r
5.39.217.76. V) y) s! k' ]- B, z3 N, F
c)$68-$62=賺左$6$ b! _, B1 t$ _6 M7 E
tvb now,tvbnow,bttvb9 i: d4 Z6 P% S# t, H/ g; x) c7 Q& r
所以:$5-$2+$6=$9 |