tolong yaaa bsk diantar

[tex]16. \: \sqrt{729} = 27[/tex]
[tex]18. \: = \sqrt{2} - \sqrt{10} \\ \: \: \: \: \: \: \: \: = \sqrt{2} - \sqrt{2 \times 5} \\ \: \: \: \: \: \: \: \: = \sqrt{2} - 1 \sqrt{5} [/tex]
[tex]20. = 3 \frac{1}{4} \times 3 \frac{3}{4} \\ \: \: \: \: \: \: \: = \frac{13}{4} \times \frac{15}{4} \\ \: \: \: \: \: \: \: = \frac{195}{4} [/tex]