20以内借十法分解式有
13-9= 11-2= 12-5= 15-6= 12-9=
11-5= 13-4= 11-3= 16-8= 13-7=
12-4= 15-8= 13-5= 14-7= 12-8=
14-9= 13-6= 18-9= 17-8= 14-6=
18-2= 17-10= 16-5= 16-6= 15-8=
16-7= 12-6= 17-9= 14-6= 11-7=
12-5= 14-7= 13-7= 14-7= 12-8=
14-5= 13-9= 16-9= 14-8= 15-7=
13-5= 16-7= 15-9= 12-4= 16-8=
15-9= 15-6= 17-8= 16-8= 11-6=
