(1)
54+28=
14÷7=
45÷9=
7×3=
8×5=
16÷8=
9×4=
9+3=
6+35=□
68+76=
87-49=
46+38=
37-947-19 60-1560-51 74+878+4
45+3545+53 71-1971+19 46-747-6