Question

Media geometrica dintre 12 si un nr este 18.Aflati numarul necunoscut

Answer 1

$\sqrt{a*b} =18 \\ \sqrt{12*b} =18 \\ \sqrt{12} * \sqrt{b} =18 \\ \sqrt{b} = \frac{18}{2 \sqrt{3} } \\ \sqrt{b} = \frac{9}{ \sqrt{3} } \\ \sqrt{b} = \frac{9 \sqrt{3} }{3} \\ \sqrt{b} =3 \sqrt{3} \\ \sqrt{b} = \sqrt{27} =\ \textgreater \ b=27$