Bài 67 trang 36 SGK Toán 9 tập 1

Hãy tìm

\(\sqrt[3]{512};\,\,\, \sqrt[3]{-729}; \,\,\,\sqrt[3]{0,064}, \,\,\,\,\sqrt[3]{-0,216};\,\,\, \sqrt[3]{-0,008}.\)

Ta có:

+ \(\sqrt[3]{512}=\sqrt[3]{8^3}=8;\)

+ \(\sqrt[3]{-729}=\sqrt[3]{(-9)^3}=-9;\)

+ \(\sqrt[3]{0,064}=\sqrt[3]{0,4^3}=0,4;\)

+ \(\sqrt[3]{-0,216}=\sqrt[3]{(-0,6)^3}=-0,6;\)

+ \(\sqrt[3]{-0,008}=\sqrt[3]{(-0,2)^3}=-0,2.\)