Răspuns:
Explicație pas cu pas:
d²=a²+a²+a²=3a² 9=3a² a²=3 a=√3 dm
V=a³=3√3 dm³ 1dm³=1l
V=3√3l
[tex]\it d=\ell\sqrt3 \Rightarrow d^3=3\sqrt3\ell^3 \Rightarrow \ell^3=\dfrac{d^3}{3\sqrt3} \Rightarrow \mathcal{V}_{cub}=\dfrac{3^3}{3\sqrt3}=3\sqrt3\ dm^3=\\ \\ =3\sqrt3\ \ell itri \approx 5,2 \ell itri[/tex]