a)$60-$55=賺左$5os.tvboxnow.com7 z. }5 M# ~+ C g7 N/ T
2 ]: M; _' n; H, l" Mos.tvboxnow.comb)$60-$62=花多左$2( p' O0 R8 l3 k
tvb now,tvbnow,bttvb$ V) [: x( `, p
c)$68-$62=賺左$6
! F: s6 N1 W& Ptvb now,tvbnow,bttvb tvb now,tvbnow,bttvb- F+ \4 w9 b+ k: |+ V9 u% P. ^
所以:$5-$2+$6=$9 |