Cách 1:
`(1/9)^25 : (1/3)^30`
`= ((1/3)^2)^25 : (1/3)^30`
`= (1/3)^50 : (1/3)^30`
`= (1/3)^(50 - 30)`
`= (1/3)^20`
Cách 2:
`(1/9)^25 : (1/3)^30`
`= (1/9)^25 : (1/3)^(2.15)`
`= (1/9)^25 : ((1/3)^2)^15`
`= (1/9)^25 : (1/9)^15`
`= (1/9)^(25-15)`
`= (1/9)^10`
(Chúc bạn học tốt)
