6.4-3.32=
578+298=
48×25%=
-=
1÷=
4÷=
12×2.5=
+=
4.35÷0.5=
302×8.89=
799×20=
①( + )×54
②8.5×4.68+1.5×4.68
③ × + ×
④125×32×25