20 以内退位减法（ 1）11-7= 13-5= 14-9= 12-8= 11-9= 12-9= 12-7= 11-3= 12-3= 16-7= 15-6= 13-9= 17-9= 14-8= 15-9= 17-8= 13-8= 12-6= 14-7= 11-6= 14-6= 11-4= 11-2= 13-4= 13-6= 12-4= 11-8= 12-5= 13-7= 14-5= 15-7= 18-9= 11-5= 15-8= 16-9= 16-8= 13-8= 12-6= 14-7= 11-6= 13-7= 14-5= 15-7= 18-9= 12-3= 16-7= 15-6= 13-9= 20 以内退位减法（ 2）12-3= 16-7= 15-6= 13-9= 14-6= 11-4= 11-2= 13-4= 13-8= 12-6= 14-7= 11-6= 11-7= 13-5= 14-9= 12-8= 13-7= 14-5= 15-7= 18-9= 11-9= 12-9= 12-7= 11-3= 13-6= 12-4= 11-8= 12-5= 17-9= 14-8= 15-9= 17-8= 11-5= 15-8= 16-9= 16-8= 13-7= 14-5= 15-7= 18-9= 11-5= 17-9= 15-9= 11-3= 14-9= 12-9= 12-7= 14-7= 20 以内退位减法（ 3）14-6= 11-4= 11-2= 13-4= 12-3= 16-7= 15-6= 13-9= 13-8= 12-6= 14-7= 11-6= 17-9= 14-8= 15-9= 17-8= 11-5= 15-8= 16-9= 16-8= 11-9= 12-9= 12-7= 11-3= 13-7= 14-5= 15-7= 18-9= 11-7= 13-5= 14-9= 12-8= 13-6= 12-4= 11-8= 12-5= 13-8= 12-6= 14-7= 11-6= 12-3= 16-7= 15-6= 13-9= 11-5= 15-8= 16-9= 16-8= 20 以内退位减法（ 4）11-9= 12-9= 12-7= 11-3= 14-6= 11-4= 11-2= 13-4= 11-5= 15-8= 16-9= 16-8= 13-6= 12-4= 11-8= 12-5= 17-9= 14-8= 15-9= 17-8= 13-7= 14-5= 15-7= 18-9= 12-3= 16-7= 15-6= 13-9= 13-8= 12-6= 14-7= 11-6= 11-7= 13-5= 14-9= 12-8= 11-9= 12-9= 12-7= 11-3= 13-7= 14-5= 15-7= 18-9= 13-6= 12-4= 11-8= 12-5= 20 以内退位减法（ 5）11-5= 15-8= 16-9= 16-8= 17-9= 14-8= 15-9= 17-8= 13-6= 12-4= 11-8= 12-5= 12-3= 16-7= 15-6= 13-9= 11-9= 12-9= 12-7= 11-3= 13-8= 12-6= 14-7= 11-6= 11-7= 13-5= 14-9= 12-8= 14-6= 11-4= 11-2= 13-4= 13-7= 14-5= 15-7= 18-9= 11-7= 13-5= 14-9= 12-8= 13-8= 12-6= 14-7= 11-6= 12-3= 16-7= 15-6= 13-9= 20 以内退位减法（ 6）17-9= 14-8= 15-9= 17-8= 11-5= 15-8= 16-9= 16-8= 13-8= 12-6= 14-7= 11-6= 11-7= 13-5= 14-9= 12-8= 14-6= 11-4= 11-2= 13-4= 13-7= 14-5= 15-7= 18-9= 12-3= 16-7...
