80÷20=
60÷5=
350÷7=
480÷80=
91÷7=
47×2=
640÷8=
300÷60=
78÷3=
125×8=
①302×46=
②350×28=
③389÷72=
④315÷35=
⑤815÷27=
42-22=(4+2)×(4-2)=12
72-32=(7+3)×(7-3)=4092-42=(9+4)×(9-4)=65
152-52=(+)×(-)