Răspuns:
307286+12503=319789
proba=319789-12503=307287
985273-262102=723171
proba=723171+262102=985273
72568+683542=756110
proba=756110-683542=72568
526048-487359=32689
proba 32689+487359=526048
512093+298348=810441
proba=512093-298348=810441
700000-123458=576542
proba=123458+576542=700000