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Suma a trei numere consecutive este 639.Afla numerele

Răspuns :

a+a+1+a+2=639
3a+3=639
3a=639-3
3a=636
a=636:3
a=212
a+1=213
a+2=214
\-----\a
\-----\+1\
\-----\+1\+1\
Proba=212+213+214=639