Решите плиз, дам 30 баллов

Решите задачу:

$1)4\sqrt{2\frac{7}{9} }-2=4\sqrt{\frac{25}{9}}-2=4*\frac{5}{3}-2=\frac{20}{3}-2=6\frac{2}{3}-2=4\frac{2}{3}\\\\2)\frac{\sqrt{125} }{\sqrt{5} }=\sqrt{\frac{125}{5} }=\sqrt{25}=5\\\\3)3\sqrt{50}-\sqrt{98} =3\sqrt{25*2}-\sqrt{49*2}=3*5\sqrt{2}-7\sqrt{2}=15\sqrt{2}-7\sqrt{2}=8\sqrt{2}\\\\4)(\sqrt{5}-\sqrt{2})(\sqrt{5}+\sqrt{2})=(\sqrt{5})^{2}-(\sqrt{2})^{2}=5-2=3\\\\5)3\sqrt{2}<\sqrt{20}\\\\\sqrt{9*2}<\sqrt{20}\\\\\sqrt{18}<\sqrt{20}\\\\$