a) \(=\left[\sqrt{2}\left(3+4-5\right)\right].\sqrt{2}=\left(3+4-5\right).2=2.2=4\)
b) \(=5\sqrt{2}-3\sqrt{2}+10\sqrt{2}-9\sqrt{2}=3\sqrt{2}\)
c) \(=\sqrt{\left(\sqrt{3}+1\right)^2}-\sqrt{3}=\sqrt{3}+1-\sqrt{3}=1\)
a. \(\left(\sqrt{18}+\sqrt{32}-\sqrt{50}\right).2\)
= \(\left(\sqrt{9.2}+\sqrt{16.2}-\sqrt{25.2}\right).2\)
= \(\left(3\sqrt{2}+4\sqrt{2}-5\sqrt{2}\right).2\)
= \(\left[\sqrt{2}\left(3+4-5\right)\right].2\)
= \(2\sqrt{2}.2\)
= \(4\sqrt{2}\)
b. \(\sqrt{50}-\sqrt{18}+\sqrt{200}-\sqrt{162}\)
= \(\sqrt{2.25}-\sqrt{9.2}+\sqrt{100.2}-\sqrt{81.2}\)
= \(5\sqrt{2}-3\sqrt{2}+10\sqrt{2}-9\sqrt{2}\)
= \(\sqrt{2}\left(5-3+10-9\right)\)
= \(3\sqrt{2}\)
(c bn để mik nghĩ chút nhé)
