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Media geometrica a numerelor
[tex]3 \sqrt{21} [/tex]
si x

este egala cu
[tex]3 \sqrt{7} [/tex]
Aflati numarul x.



Răspuns :

[tex]\displaystyle\sqrt{3\sqrt{21}\cdot x}=3\sqrt7\\\\3\sqrt{21}\cdot x=(3\sqrt7)^2\\3\sqrt{21}\cdot x=63\\\\\displaystyle x=\frac{63}{3\sqrt{21}}=\frac{21}{\sqrt{21}}\\\\x=\sqrt{21}[/tex]