256+518=?,276+517=?,429+687=?
752-66=?,863-203=?,810-313=?
26+?=863,256+?=853,315+?=911
35*6=?,27*8=?,92*4=?
69/3=?,56/4=?,125/5=?
---
?-258=773-425,138+257+352+132=?
885-258=?+328,338+100+281-676=?
296+?+385=931,479+205-159-349=?
209+?-418=237,999-334-158-337=?
此事古难全