Question

[Tô Thu Huyền]

Rút gọn các biểu thức:

a. A= \(\sqrt{75}\)+\(\sqrt{48}\)-\(\sqrt{300}\)

b. B=\(\sqrt{98}\)-\(\sqrt{72}\)+\(0,5\sqrt{8}\)

c. C= \(\left(5\sqrt{5}-\sqrt{75}+\sqrt{125}\right)\):\(\sqrt{5}\)

Answer 1

[Nguyễn Nhật Minh]

\(a.A=\sqrt{75}+\sqrt{48}-\sqrt{300}=\sqrt{25.3}+\sqrt{16.3}-\sqrt{100.3}=5\sqrt{3}+4\sqrt{3}-10\sqrt{3}=-\sqrt{3}\) \(b.B=\sqrt{98}-\sqrt{72}+0,5\sqrt{8}=\sqrt{49.2}-\sqrt{36.2}+0,5\sqrt{4.2}=7\sqrt{2}-6\sqrt{2}+\sqrt{2}=2\sqrt{2}\) \(c.\dfrac{5\sqrt{5}-\sqrt{15.5}+5\sqrt{5}}{\sqrt{5}}=\dfrac{\sqrt{5}\left(10-\sqrt{15}\right)}{\sqrt{5}}=10-\sqrt{15}\)

Answer 2

[Thành Trương]