254+540=?,283+525=?,452+658=?
756-13=?,889-296=?,835-339=?
75+?=848,291+?=838,388+?=911
48*5=?,53*3=?,72*10=?
64/?=?,100/5=?,96/4=?
---
?-206=780-404,162+234+324+140=?
828-225=?+381,388+196+245-652=?
282+?+387=961,425+284-116-304=?
205+?-486=209,999-358-178-378=?
做梦翻床底