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Daca a/5-√3=5+√3/b atunci media geometrica a numerelor a si b este egala cu ..................

Răspuns :

a/(5-√3)=(5+√3)/b
ab=
(5-√3)(5+√3)=25-9=16
√ab=√16=4

[tex]\it \dfrac{a}{5-\sqrt3} = \dfrac{5+\sqrt3}{b} \Leftrightarrow ab=(5-\sqrt3)(5+\sqrt3)\Leftrightarrow ab =5^2-(\sqrt3)^2[/tex]

[tex]\Leftrightarrow \it ab = 25 -3 \Leftrightarrow ab = 23[/tex]

[tex]\it m_a =\sqrt{ab} =\sqrt{23}[/tex]