[tex]A. \ \sqrt{3}\times\sqrt{5}\times\sqrt{15} = \sqrt{3\times5\times15} = \sqrt{15\times15}=\sqrt{15^{2}} = 15[/tex]
[tex]B. \ \sqrt{\frac{4}{5}}\times\sqrt{0,6}\times\sqrt{12} =\sqrt{0,8\times0,6\times12}=\sqrt{5,76} = \sqrt{2,4^{2}}=2,4[/tex]
[tex]C. \ \sqrt[3]{1\frac{1}{5}}\times\sqrt[3]{2,5}\times\sqrt[3]{1\frac{1}{8}}=\sqrt[3]{1\frac{2}{10}}\times\sqrt[3]{2,5}\times\sqrt[3]{1\frac{125}{1000}}=\sqrt[3]{1,2\times2,5\times1,125}=\\\\=\sqrt[3]{3,375} = \sqrt[3]{1,5^{3}} = 1,5[/tex]
