Question

Очень нужна помощь!!!

Answer 1

$(\sqrt{75}-2\sqrt{3}-\sqrt{27})^2=(\sqrt{25\cdot 3}-2\sqrt{3}-\sqrt{9\cdot 3})^2=\\\\=(5\sqrt{3}-2\sqrt{3}-3\sqrt{3})^2=(5\sqrt3-5\sqrt3)^2=0^2=0$