423+330=?,253+429=?,986+742=?
768-29=?,964-603=?,1345-750=?
90+?=858,228+?=789,1233+?=1685
39*7=?,9*85=?,812*5=?
639/3=?,272/8=?,708/6=?
---
?-241=896-482,135+162+461+375=?
702-273=?+323,555+531+350-1210=?
201+?+362=959,1061+585-736-669=?
251+?-594=492,1955-661-577-428=?
星空地球仪