Question

Tính:

a) \(\sqrt[3]{5}:\sqrt[3]{{625}};\)                          

b) \(\sqrt[5]{{ - 25\sqrt 5 }}.\)

Answer 1

a: \(=\sqrt[3]{\dfrac{5}{625}}=\sqrt[3]{\dfrac{1}{125}}=\dfrac{1}{5}\)

b: \(=\sqrt[5]{\left(-\sqrt{5}\right)^5}=-\sqrt{5}\)