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

Răspuns :

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