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doua nr sunt invers proportionale cu 7.5 si 30 iar media lor aritmetica este 7.5.Calculeaza media geometrica(proportionala)a celor doua numere

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Răspuns :

Fie a si b cele doua numere => a*7.5=k si b*30=k =>a=k/7,5 si b=k/30..... media aritmetica a+b=15=> k/7.5+ k/30=15.... aduci la acelasi numitor si aflii k, dupa care aflii a si b.....

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