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Find the cube of : 7/9 (ii) 8/(11) ...

Find the cube of : `7/9` (ii) `8/(11)` (iii) `(12)/7` (iv) `(13)/8`

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(i)`7/9`
`(7/9)^3`
`(7^3)/(9^3)`
`343/729`
(ii)`8/11`
`(8/11)^3`
`(8^3)/(11^3)`
`-512/1331`
(iii)`12/7`
`(12/7)^3`
`(12^3)/(7^3)`
`1728/343`
(iv)`13/8`
`(13/8)^3`
`(13^3)/(8^3)`
`2197/512`
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