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daca a/b=3/5, determinati 3a+b/a+5b

Răspuns :

=> a=3k  si b=5k  
=> (3*3k + 5k) / (3k+5*5k) = 14k / 28k = 1/2 (am simplificat cu 14k  pt. ∀ k∈R*)