jawab pertanyaan nya no 3 sampai 5 ya!jawab pake cara!jangan ngasal!

3.
[tex]s = 9 \sqrt{3} = \sqrt{243} = {243}^{ \frac{1}{2} } \\ v = {s}^{3} \\ v = { ({243}^{ \frac{1}{2} }) }^{3} = {243}^{ \frac{3}{2} } {cm}^{3} [/tex]
4.
[tex](10 + \sqrt{5} )(8 - \sqrt{5} ) \\ 80 - 10 \sqrt{5} + 8 \sqrt{5} - 5 \\ 75 - 2 \sqrt{5} \: {cm}^{2} [/tex]