Đáp án+Giải thích các bước giải:

`a) `

`0,6^5 / 0,2^6 `

`= (6/10)^5/(2/10)^6`

`= (6^5 / 10^5)/(2^6 / 10^6) `

`= (6^5 / 10^5) * (10^6 / 2^6)`

`= (6^5 * 10^6) / (10^5 * 2^6) `

`= (6^5 * 10) / (2^6) `

`= ( (23)^5 * 10 ) / (2^6) `

`= (2^5 * 3^5 * 10) / (2^6)`

`= (2^5 * 3^5 * 25) / (2^6)`

`= (2^6 * 3^5 * 5) / (2^6)`

`= (3^5 * 5)`

`= 243 * 5`

`= 1215 `

`b)`

`(2^7 * 9^3) / (6^5 * 8^2) `

`= (2^7 * (3^2)^3) / ( (2*3)^5 * (2^3)^2 ) `

`= (2^7 * 3^6) / (2^5 * 3^5 * 2^6) `

`= (2^7 * 3^6) / (2^{11} * 3^5) `

`= (2^7 / 2^{11}) * (3^6 / 3^5) `

`= 2^(-4) * 3^1 `

`= (1 / 2^4) * 3`

`= (1 / 16) * 3 `

`= 3 / 16 `