56+?=152,78+?=197,91+?=254
168-66=?,222-148=?,453-268=?
71+87=?,72+164=?,156+288=?
4*5=?,6*7=?,8*9=?
21/7=?,48/6=?,54/9=?
---
?-147=273-142,74+92+86+103=?
187-85=?+68,78+69+126-235=?
84+?+92=213,184+82-97-126=?
149+?-68=205,500-138-227-115=?
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