225+329=?,163+425=?,305+767=?
670-37=?,978-536=?,932-283=?
58+?=679,545+?=790,237+?=905
49*7=?,86*6=?,163*6=?
216/6=?,534/8=?,864/9=?
---
?-280=869-436,169+155+471+158=?
714-264=?+388,558+380+264-916=?
294+?+310=988,493+257-191-340=?
244+?-455=333,999-368-108-321=?
出现疫情封