Question

Решите пожалуйста!!!!ОЧЕНЬ СРОЧНО!!!!

Answer 1

$\displaystyle 1)5\sqrt{12}-2\sqrt{27}-3\sqrt{3}=10\sqrt{3}-6\sqrt{3}-3\sqrt{3}=\sqrt{3}\\\\ 2)-\frac{2}{3}\sqrt{27}+\frac{1}{5}\sqrt{300}+5\sqrt{3}=-2\sqrt{3}+2\sqrt{3}+5\sqrt{3}=5\sqrt{3}\\\\ 3)(\sqrt{7}-\sqrt{3})^2=7-2\sqrt{21}+3=10-2\sqrt{21}$