20以内进位加法和退位减法口算题

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