Question

помогите пж
спростить вираз
​

Answer 1

$1)5\sqrt{2}-4\sqrt{8}+3\sqrt{32}=5\sqrt{2}-8\sqrt{2}+3\cdot2^2\sqrt{2}=5\sqrt{2}-8\sqrt{2}+3\cdot4\sqrt{2}=5\sqrt{2}-8\sqrt{2}+12\sqrt{2}=9\sqrt{2}\\2)(\sqrt{12}-\sqrt{75})\sqrt{3}=(2\sqrt{3}-5\sqrt{3})\sqrt{3}=(-3\sqrt{3})\sqrt{3}=-3\sqrt{3}\sqrt{3}=-3\cdot3=-9\\3)(\sqrt{7}-3)^2=7-6\sqrt{7}+9=16-6\sqrt{7}$
4) Формула: (a - b) (a + b) = a² - b²
$4)(\sqrt{5}+\sqrt{2})(\sqrt{5}-\sqrt{2})=5-2=3$