Explicație pas cu pas:
[tex]x = ( \frac{8}{3 \sqrt{2} } + \frac{6}{ \sqrt{2} } ) \times \frac{ \sqrt{2} }{13} = \\ \frac{8 + 18}{3 \sqrt{2} } \times \frac{ \sqrt{ 2} }{13} = \frac{26}{39} = \frac{2}{3} [/tex]
[tex]y = ( \frac{1}{ \sqrt{3} } - \frac{5}{7 \sqrt{3} } ) \div \frac{ \sqrt{3} }{14} = \\ \frac{7 - 5}{ 7\sqrt{3} } \div \frac{ \sqrt{3} }{14} = \\ \frac{2}{7 \sqrt{3} } \times \frac{14}{ \sqrt{3} } = \\ \frac{4}{3} [/tex]
[tex]media \: aritmetica = \frac{ \frac{2}{3} + \frac{4}{3} }{2} = \\ = \frac{6}{3} \div 2 = 2 \div 2 = 1[/tex]
