c)
\sqrt{6,4}:\sqrt{10}=\sqrt{6,4:10}=\sqrt{0,64}=0,8
d)
\sqrt[3]{10}*\sqrt[3]{0,1}=\sqrt[3]{10*0,1}=\sqrt[3]1=1
e)
\sqrt[3]{2\frac{2}{3}}*\sqrt[3]{\frac{1}{9} }=\sqrt[3]{\frac{8}{3}*\frac{1}{9}}=\sqrt[3]{\frac{8}{27}}=\frac{2}{3}
f)
\frac{\sqrt[3]{2,7}}{\sqrt[3]{100}}=\sqrt[3]{2,7:100}=\sqrt[3]{0,027}=0,3
h)
\frac{\sqrt[3]{128}}{\sqrt[3]{-2}}=\sqrt[3]{-64}=-4
g)
\sqrt[3]{-9}*\sqrt[3]3=\sqrt[3]{-27}=-3
i)
\frac{\sqrt[3]{-0,5}*\sqrt[3]4}{\sqrt[3]{16}}=\frac{\sqrt[3]{-2}}{\sqrt[3]{16}}=\sqrt[3]{-\frac{1}{8}}=-\frac{1}{2}