442+321=?,222+410=?,956+752=?
750-63=?,990-677=?,1548-719=?
84+?=829,203+?=1142,1297+?=1672
75*7=?,9*288=?,839*5=?
192/3=?,784/8=?,1620/6=?
---
?-221=803-414,165+144+493+349=?
728-277=?+333,555+449+445-1296=?
254+?+349=968,1069+522-486-945=?
259+?-552=585,2134-620-777-400=?
香皂打细菌