Question

Tính:

a) \(\sqrt[3]{{ - 125}}\);                            

b) \(\sqrt[4]{{\frac{1}{{81}}}}.\)

Answer 1

a: \(\sqrt[3]{-125}=\sqrt[3]{\left(-5\right)^3}=-5\)

b: \(\sqrt[4]{\dfrac{1}{81}}=\sqrt[4]{\left(\dfrac{1}{3}\right)^4}=\dfrac{1}{3}\)

Answer 2

a) \(\sqrt[3]{-125}=\sqrt[3]{\left(-5\right)^3}=-5\)

b) \(\sqrt[4]{\dfrac{1}{81}}=\sqrt[4]{\left(\dfrac{1}{3}\right)^4}=\dfrac{1}{3}\)