Question

Afla termenul necunoscut. □+512=720,129+□=670,□+237=976,□-328=139,□-457=208,□-548=329,890-□=207,352-□=124,685-□=466

Answer 1

□+512=720 = 720-512= 208
129+□=670= 670-129=541
□+237=976=976-237= 739
□-328=139 = 139+328= 467
□-457=208=208+457=665
□-548=329= 329+548=877
890-□=207=890-207=683
352-□=124= 352-124=228
685-□=466= 685-466=219
casutele sunt numerele din scăderile si adunarile alea