Đáp án:
`a, (3^2 . 27^4)/(9^3)`
`= (3^2 . (3^3)^4)/((3^2)^3)`
`= (3^2 . 3^12)/(3^6)`
`= (3^14)/(3^6)`
`= 3^8`
`= 6561`
`b, (3^4 . 3^5)/(3^3)`
`= (3^(4 + 5))/(3^3)`
`= (3^9)/(3^3)`
`= 3^6`
`= 729`
`d, (125^2 : 25^2)/54`
`= ((5^3)^2 : (5^2)^2)/54`
`= (5^6 : 5^4)/54`
`= (5^2)/54`
`= 25/54`