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calculati media aritmetica a urmatoarelor numere rationale pozitive:7 supra 2.,5 supra 4.,7 supra 8​

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[tex] \frac{ \frac{7}{2} + \frac{5}{4} + \frac{7}{8} }{3} = \frac{ \frac{7 \times 4}{8} + \frac{5 \times 2}{8} + \frac{7}{8} }{3} = \frac{28 + 10 + 7}{3} = \frac{38 + 7}{3} = \frac{45}{3} = 15[/tex]