Question

[lê thị bảo ngọc]

Bài 5> Rút gọn căn cho một số bằng phép khai phương

1> \(\sqrt{50}\) - \(\sqrt{18}\) + \(\sqrt{200}\) - \(\sqrt{162}\)

2> \(5\sqrt{5}\) + \(\sqrt{20}\) - 3\(\sqrt{45}\)

3> \(5\sqrt{48}\) - \(4\sqrt{27}\) - 2\(\sqrt{75}\) + \(\sqrt{108}\)

4> \(\dfrac{1}{2}\sqrt{48}\) - 2\(\sqrt{75}\) - \(\dfrac{\sqrt{33}}{\sqrt{11}}\) + 5\(\sqrt{1\dfrac{1}{3}}\)

5> \(3\sqrt{12}\) - 4\(\sqrt{27}\) + 5\(\sqrt{48}\)

6> \(\sqrt{12}\) + \(5\sqrt{3}\) - \(\sqrt{48}\)

7> \(3\sqrt{50}\) - 2\(\sqrt{12}\) \(\sqrt{18}\) +\(\sqrt{75}\) - \(\sqrt{8}\)

8> \(2\sqrt{75}\) - \(3\sqrt{12}\) + \(\sqrt{27}\)

Answer 1

[Đức Trịnh Minh]

1.\(=5\sqrt{2}-3\sqrt{2}+10\sqrt{2}-9\sqrt{2}=3\sqrt{2}\)

2.\(=5\sqrt{5}+4\sqrt{5}-9\sqrt{5}=0\)