2 câu trả lời
`(70^5)/(2^3 . 21^6)`
`= (7^5 . 2^5 . 5^5)/(2^3 . 7^6 . 3^6)`
`= (2^2 . 5^5)/(7 . 3^6)`
`= (2^2 . 5^2 . 5^3)/(3 . 7 . 7^5)`
`= ((2.5)^2 . 5^3)/((3.7) .7^5)`
`= (10^2 . 5^3)/(21 . 7^5)`
`(70^5)/(2^3 . 21^6)`
`= (7^5 . 2^5 . 5^5)/(2^3 . 7^6 . 3^6)`
`= (2^2 . 5^5)/(7 . 3^6)`
`= (2^2 . 5^2 . 5^3)/(3 . 7 . 7^5)`
`= ((2.5)^2 . 5^3)/((3.7) .7^5)`
`= (10^2 . 5^3)/(21 . 7^5)`