20以内减法计算题

13-4= 13-5= 12-4= 10-4= 14-8= 17-9= 10-6= 10-5= 17-9= 12-7= 14-9= 14-8= 11-8= 11-2= 11-5= 10-7= 15-9= 16-8= 13-5= 11-6= 15-6= 14-10= 14-9= 18-12= 14-4= 17-13= 15-10= 7-4= 14-7= 13-3= 13-5= 20-17= 4-2= 12-5= 13-1= 3-1= 17-16= 10-3= 14-1= 14-5= 17-8= 8-7= 16-13= 12-10= 20-14= 16-10= 17-9= 18-14= 13-9= 7-1= 18-15= 15-15= 15-5= 12-9= 18-3= 19-5= 16-15= 15-2= 11-2= 5-4= 19-11= 15-12= 6-3= 14-11= 15-14= 15-8= 20-2= 2-1= 9-8= 9-2=

9-3= 18-10= 20-12= 20-5= 19-18= 14-8= 4-3= 20-18= 8-5= 13-7= 19-10= 8-2= 14-7= 17-14= 18-9= 7-6= 11-8= 17-1= 20-15= 9-5= 9-1= 16-2= 14-5= 14-12= 16-3= 19-8= 16-12= 13-12= 14-13= 17-4= 11-9= 10-2= 19-16= 12-2= 20-6= 18-11= 10-8= 16-9= 13-6= 15-1= 13-4= 11-4= 10-7= 17-6= 19-15= 18-2= 9-7= 18-6= 10-3= 5-3= 8-6= 5-1= 19-6= 13-6= 20-16= 7-3= 12-11= 17-3= 10-9= 13-10= 7-5= 19-1= 9-2= 17-11= 15-3= 6-4= 17-15= 16-1= 6-1= 8-3= 17-4= 7-2= 16-14= 19-4= 17-2= 20-1= 17-7= 13-2= 16-11= 19-2= 16-8= 9-6= 12-7= 4-1= 13-8= 18-17= 19-12= 11-7= 20-5= 15-11= 14-6= 20-13= 20-17= 18-16= 19-14= 10-1= 16-5= 20-8=