248+475=?,295+537=?,495+519=?
74+?=826,457+?=893,327+?=968
437-62=?,755-196=?,894-348=?
14*7=?,28*5=?,20*10=?
56/?=?,56/4=?,250/5=?
---
?-326=719-433,175+292+385+120=?
825-276=?+395,383+106+214-655=?
205+?+393=926,414+292-106-385=?
249+?-438=229,999-374-105-393=?
重要的事情