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3) Afla numarul necunoscut:
a)5247-2158-a=1918
3122+b+1099=7200

b)4175+a-3643=1989
9206-b+1302=10000


Răspuns :

a) 5247-2158-1171=1918 3121+2979+1099=7200 b)4175+7818-3643=1989 9206-7904+1302=10000