245+503=?,223+578=?,432+664=?
733-18=?,815-281=?,812-320=?
13+?=813,280+?=807,304+?=935
18*5=?,24*8=?,35*6=?
42/?=?,102/6=?,118/9=?
---
?-274=790-420,174+269+318+194=?
806-229=?+350,309+185+275-687=?
297+?+379=919,455+280-159-369=?
230+?-424=250,999-387-185-385=?
丰收季节秋