Упростить выражение: 1)4√(7/2)-0,5√56-3√(14/9) 2)3√(7/3)-√84 - 4√(21/4)

Решите задачу:

$1.\; \; 4\sqrt{\frac{7}{2}}-0,5\sqrt{56}-3\sqrt{\frac{14}{9}}=4\sqrt{\frac{7}{2}}-\frac{1}{2}\cdot \sqrt{4\cdot 14}-3\cdot \frac{\sqrt{14}}{3}=\\\\=4\sqrt{\frac{7}{2}}-\frac{1}{2}\cdot 2\sqrt{14}-\sqrt{14}=\frac{2\cdot 2\cdot \sqrt7}{\sqrt2}-2\sqrt{14}=2\sqrt2\cdot \sqrt7-2\sqrt{14}=\\\\=2\sqrt{14}-2\sqrt{14}=0$

$2.\\3\sqrt{\frac{7}{3}}-\sqrt{84}-4\sqrt{\frac{21}{4}}=\sqrt3*\sqrt7-2\sqrt{21}-\sqrt4*\sqrt{21}=\\\\=\sqrt{21}-2\sqrt{21}-2\sqrt{21}=-3\sqrt{21}$