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1. Afla numarul necunoscut fara a efectua calculele.
a) 125+234+a=234+125+354 ----------------------> a=.................
b) 345+436-436=b -----------------------> b= ................
c) 876+c=876 ----------------------> c=.................
d) 859+d-859+d=200 ----------------------> d=.................