452+352=?,266+412=?,934+797=?
749-52=?,948-654=?,1381-710=?
88+?=873,272+?=779,1266+?=1688
15*7=?,9*95=?,802*4=?
642/3=?,248/8=?,744/6=?
---
?-241=861-495,161+170+429+341=?
792-269=?+318,538+572+379-1275=?
238+?+331=920,1096+512-764-670=?
270+?-526=474,1945-690-553-477=?
咳嗽吐浓痰