412+380=?,207+493=?,417+738=?
756-14=?,998-613=?,950-166=?
69+?=832,219+?=766,374+?=997
84*7=?,67*9=?,276*4=?
424/8=?,765/5=?,954/6=?
---
?-220=833-486,114+184+492+196=?
702-228=?+341,500+356+220-963=?
261+?+302=945,462+407-264-348=?
251+?-558=409,999-203-135-413=?
世界那么美