415+308=?,248+407=?,924+793=?
777-89=?,915-652=?,1556-713=?
18+?=857,225+?=1198,1259+?=1675
28*7=?,9*405=?,847*5=?
171/3=?,752/8=?,1794/6=?
---
?-251=879-405,187+111+473+376=?
709-222=?+341,509+431+434-1206=?
246+?+375=956,1084+553-493-911=?
256+?-503=523,2152-671-773-486=?
415+308=
248+407=
924+793=
777-89=
915-652=
1556-713=
18+=857
225+=1198
1259+=1675
28×7=
9×405=
847×5=
171÷3=
752÷8=
1794÷6=
-251=879-405
187+111+473+376=
709-222=+341
509+431+434-1206=
246++375=956
1084+553-493-911=
256+-503=523
2152-671-773-486=
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