[tex]1. \\ \sqrt{45} ≈6.7082039≈6.71[/tex]
[tex]2. \\ \sqrt[3]{4} \times \sqrt[3]{12} = \sqrt[3]{48} = \sqrt[3]{6 \times 8} = 2 \sqrt[3]{6} [/tex]
[tex]3. \frac{1}{4} \sqrt{8} [/tex]
[tex]3 \sqrt[3]{7} = \sqrt[3]{7 \times 3 \times 3 \times 3} = \sqrt[3]{189} [/tex]
