н) $$8\sqrt{64} = 8 \cdot 8 = 64$$.
о) $$0{,}1\sqrt{2\frac{1}{4}}+0{,}2\sqrt{1\frac{9}{16}} = 0{,}1\sqrt{\frac{9}{4}}+0{,}2\sqrt{\frac{25}{16}} = 0{,}1 \cdot \frac{3}{2} + 0{,}2 \cdot \frac{5}{4} = 0{,}1 \cdot 1{,}5 + 0{,}2 \cdot 1{,}25 = 0{,}15 + 0{,}25 = 0{,}4$$.
п) $$0{,}2-\frac{1}{6}\sqrt{1{,}44} = 0{,}2 - \frac{1}{6} \cdot 1{,}2 = 0{,}2 - \frac{1{,}2}{6} = 0{,}2 - 0{,}2 = 0$$.
р) $$\sqrt{\frac{4}{9}}-\sqrt{\frac{121}{169}} = \frac{2}{3} - \frac{11}{13} = \frac{2 \cdot 13}{3 \cdot 13} - \frac{11 \cdot 3}{13 \cdot 3} = \frac{26}{39} - \frac{33}{39} = -\frac{7}{39}$$.
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