Ответ:

1) \(\sqrt{0.16\cdot36}=\sqrt{5.76}=2.4.\)

2) \(\sqrt[8]{\frac{1}{4}}=\sqrt[8]{2^{-2}}=2^{-1/4}=\frac{1}{\sqrt[4]{2}}\), а \(\sqrt{1.44}=1.2\).

\(\sqrt[8]{\frac{1}{4}}+5\sqrt{1.44}=\frac{1}{\sqrt[4]{2}}+5\cdot1.2=6+\frac{1}{\sqrt[4]{2}}.\)

3) \(\sqrt{8}\cdot\sqrt{18}-\frac{\sqrt{98}}{\sqrt{2}}=\sqrt{144}-\sqrt{49}=12-7=5.\)

Ответ: 1) 2,4; 2) \(6+\frac{1}{\sqrt[4]{2}}\); 3) 5.