Question

Rút gọn rồi tính:
a) \(5\sqrt{\left(-2\right)^4}\)                                        c)\(\sqrt{\sqrt{\left(-5\right)^8}}\)

b)\(-4\sqrt{\left(-3\right)^6}\)

Answer 1

\(5\sqrt{\left(-2\right)^4}=5\sqrt{4^2}=5.4=20\)

\(-4\sqrt{\left(-3\right)^6}=-4\sqrt{27^2}=-4.27=-108\)

\(\sqrt{\sqrt{\left(-5\right)^8}}=\sqrt{\sqrt{\left(5^4\right)^2}}=\sqrt{5^4}=\sqrt{25^2}=25\)