126+514=?,489+477=?,397+777=?
409-12=?,860-410=?,970-350=?
97+?=721,372+?=833,281+?=957
26*4=?,67*6=?,131*8=?
72/3=?,1000/2=?,837/9=?
---
?-278=813-422,130+106+407+114=?
815-270=?+327,330+241+263-611=?
223+?+308=936,441+256-156-315=?
213+?-407=389,999-336-137-380=?
董铺水库清