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Daca a +b=325 si c+d=137 atunci calculati :
a) a+b+c+d=?
b)a+b-c-d=?


Răspuns :

a+b=325
c+d=137

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

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