9以内口算练习

2+2=3+4=7-5=3-2=7-2=7+1=1+65-4=7-2=4+1=4+3=2+6=2+6=3+3=7+2=8-5=3+2=9-2=5-2=3+1=4+4=8-2=9-7=8-6=2+5=8