9-4=9-5=4+5=
算一算。3+3= 5+2= 3+6= 0+7= 4+6= 3+4=4+5= 8+2= 5+5=
算一算。2+3= 5+4= 1+4= 6+2= 4+0= 5+2=3+7= 4+2= 5+4=
8-2=6+2=8-6=
6-3=3+3=7-5=5+2=