Đáp án`+`Giải thích các bước giải:

 `c, (5.27^3 . 4^5)/(6^5) : ((5^5 . 2^4)/(10^4) . (2^6 . 3^4)/(6^4))`

`= (5. (3^3)^3 . (2^2)^5)/((2.3)^5) : (5^5 . 2^4 . 2^6 . 3^4)/((2.5)^4 . (2.3)^4)`

`= (5.3^9 . 2^(10))/(2^5 . 3^5) : (5^5 . 2^(10) . 3^4)/(2^4 . 5^4.  2^4 . 3^4)`

`= (5.3^4 . 2^5) : (5^5 . 2^(10) . 3^4)/(2^8 . 5^4 . 3^4)`

`= (5. 3^4 . 2^5) : (5.2^2)`

`= (5.3^4. 2^5)/(5.2^2)`

`= 3^4 . 2^3`

`= 81 . 8`

`= 648`

`***`sharksosad