Answer 1

\(\sqrt{\left(2,5\right)^2}=\left|2,5\right|=2,5\)

\(\sqrt{\dfrac{64}{25}}=\sqrt{\left(\dfrac{8}{5}\right)^2}=\left|\dfrac{8}{5}\right|=\dfrac{8}{5}\)

Answer 2

\(a,\sqrt{\left(2,5\right)^2}=\left|2,5\right|=2,5\)

\(b,\sqrt{\dfrac{64}{25}}=\sqrt{\left(\dfrac{8}{5}\right)^2}=\left|\dfrac{8}{5}\right|=\dfrac{8}{5}\)

Answer 3

8/5