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Calculati media aritmetica si media geometrica a numerelor :

a = 7-√13 b = 7+√13


Răspuns :

ma=(a+b)÷2=(7- rad13+7+rad13)
÷2=14÷2=7
mg=rad(a×b)=rad[(7 -rad13)
×(7+rad13)]
aplicam formula de calcul prescurtat (a+b)(a-b)=a la patrat
-b la patrat.
deci
mg=rad(49-13)=rad36=6