26+?=835,421+?=877,315+?=962
475-52=?,761-155=?,839-316=?
303+465=?,231+583=?,428+603=?
14*7=?,20*6=?,30*7=?
56/7=?,30/3=?,50/10=?
---
?-354=728-408,127+243+321+164=?
738-205=?+356,328+193+247-615=?
147+?+326=909,414+226-195-353=?
268+?-408=247,999-368-225-305=?
愁人定解颜