56086580 48个十4080 770-70770-700
46+22= 57+23= 120-50= 700-400= 5×7+2=
69-20= 90-36= 600+700= 80+90= 45÷9×8=
①39÷6=
②40÷7=
③651+39+538=
④☆229+68=
⑤☆800-353=
⑥226+389-198=