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DACA a+b=325 si c+d=137, calculati: a) a+b+c+d ; b) a+b-c-d


Răspuns :

a)

a+b+c+d=325+137=462

b)

a+b-c-d=325-137=188

a+b+c+d=325+137=462
a+b-(c+d)=325-137=188