Salut!
✏️ Formule:
[tex] \bf\red{m_{a} = \frac{x + y}{2} } \\ \bf\red{m_{g} = \sqrt{x \times y} }[/tex]
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[tex]m_{a} = \frac{8 + \sqrt{ \not2 } + 8 - \sqrt{ \not2} }{2} = \frac{8 + 8}{2} = \frac{16}{2} = 8[/tex]
[tex] m_{g} = \sqrt{(8 + \sqrt{2}) \times (8 - \sqrt{2} ) } = \sqrt{ {8}^{2} - { (\sqrt{2} )}^{2} } = \sqrt{64 - 2} = \sqrt{62} [/tex]
