一年级下册口算题大全:先减9再加上一位数! 11-9+4= 15-9+9= 19-9+8= 17-9+8= 11-9+8= 13-9+9= 12-9+4= 14-9+5= 17-9+8= 10-9+5= 13-9+7= 12-9+1= 15-9+3= 14-9+3= 14-9+3= 13-9+5= 14-9+5= 11-9+3= 10-9+5= 11-9+4=