Răspuns :
[tex]\it Notez\ muchia\ cubului\ cu\ \ell.\\ \\ \mathcal{A}_b =\ell^2=72 \Rightarrow\ell=\sqrt{72}=\sqrt{36\cdot2}=6\sqrt2\ cm\\ \\ \mathcal{V} =\ell^3=(6\sqrt2)^3 =216\cdot2\sqrt2=432\sqrt2\ cm^3[/tex]
[tex]\it Notez\ muchia\ cubului\ cu\ \ell.\\ \\ \mathcal{A}_b =\ell^2=72 \Rightarrow\ell=\sqrt{72}=\sqrt{36\cdot2}=6\sqrt2\ cm\\ \\ \mathcal{V} =\ell^3=(6\sqrt2)^3 =216\cdot2\sqrt2=432\sqrt2\ cm^3[/tex]