1) $\sqrt{98} - \sqrt{50} + \sqrt{128}$

2) $\sqrt{27} - \sqrt{12} - \sqrt{75} + \sqrt{48}$

3) $5\sqrt{2} + 3\sqrt{54} - 4\sqrt{128}$

4) $\sqrt{4 + \frac{1}{81} + \frac{4}{9}}$

5) $(\sqrt{2} + \sqrt{3})(3\sqrt{2} - \sqrt{3})$