tolong bantu dong dan di kasih caranya....tolong di jawab cepat plizzz saya butuh bantuan

77.
[tex] {( - 125)}^{ - \frac{1}{3} } \\ = \frac{1}{ \sqrt[3]{ - 125} } \\ = \frac{1}{ - 5} [/tex]
78.
[tex] {1 \frac{7}{9} }^ { \frac{ - 3}{2} } \\ = \sqrt[2]{ 1\frac{7}{9} } ^{ - 3} \\ = \sqrt[2]{ \frac{16}{9} }^{ - 3} \\ = \sqrt{ \frac{4096}{729} } \\ = \frac{64}{27} [/tex]