30-4= 50-6= 70-8= 80-3= 60-2=
21-8= 32-6= 43-4= 54-9= 65-8=
76-9= 87-8= 91-3= 35-8= 23-5=
44-5= 36-9= 23-8= 54-6= 60-8=
42-5=
先算:
再算:
25-6= 34-7= 43-8= 52-9= 61-5=
72-4= 84-5= 96-9= 36-8= 21-6=
22-8= 34-6= 47-9= 55-8= 63-4=
41-3= 53-6= 65-9= 72-7= 84-5=
22-5= 34-8= 46-9= 51-3= 63-5=
12-=5 -6=20 +60=65
90+=99 -5=70 +8=14