20 以内加减练习题5+14= 15-6= 14-7=6+12= 13-7= 18-6=13-9= 8+12= 18-3=15-4= 8-4= 17-5=20-3= 9-2= 16-4=16+2= 6+7= 15-4=7+8= 15-8= 13+4=19-6= 14-5= 12-4=14+3= 9-5= 11+6=11+5= 15+4= 10-8=4+3= 17-8= 9+7=12+7= 18-9= 12+6=13-6= 16+2= 13-4=18-4= 15+5= 14+5=19-3= 20-1= 15-9=5+13= 14+2= 16+3=9+7= 1+3= 17-8=13-11= 18-13= 14-11=19-14= 17-12= 16-15=
