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descopera rezultatul exercitiilor fara a efectua calculele. Justifica raspunsul.

a.8579+129-129;                                                 b.2847+913-2847;
5782-319+319;                                                     1596+0-1596;
c.7326-0-7326;                                                     d.2175+1-2175;
187+39-39-39+39.                                                 1345+1-1345-1.
scrieti in raspuns cum as scrie pe caiet.