• 1. (2023一下·大渡口) 快速算出答案

  11-4=	12-7=	6+8=	16-8=
  15-9=	14-5=	12-3=	13-6=
  12-8=	9+7=	7+6=	15-8=
  17-8=	15-9=	9+5=	13-5=
  17-8-3=	15-9+6=	14-5+3=	16-8+3=