`(2^18 . 18^7 . 3^3 + 3^15 . 2^15)/(2^10 . 6^15 + 3^14 . 15 . 4^13) - (2^10 . 9 + 1)/(2^10 . 41)`

`= (2^18 . (2 . 3^2)^7 . 3^3 + 3^15 . 2^15)/(2^10 . (2 . 3)^15 + 3^14 . 3 . 5 . (2^2)^13) - ((2^10 . 9)/(2^10 . 41) + 1/(2^10 . 41))`

`= (2^18 . 2^7 . 3^14 . 3^3 + 3^15 . 2^15)/(2^10 . 2^15 . 3^15 + 3^15 . 2^26 . 5) - 9/41 - 1/(2^10 . 41)`

`= (2^25 . 3^17 + 3^15 . 2^15)/(2^25 . 3^15 + 3^15 . 2^26 . 5) - 9/41 - 1/(2^10 . 41)`

`= (2^15 . 3^15 . (3^2 . 2^10 + 1))/(2^25 . 3^15 . (1 + 2 . 5)) - 9/41 - 1/(2^10 . 41)`

`= (3^2 . 2^10 + 1)/(2^10 . (1 + 2 . 5)) - 9/41 - 1/(2^10 . 41)`

`= (3^2 . 2^10)/(2^10 . (1 + 10)) + 1/(2^10 . (1 + 10)) - 9/41 - 1/(2^10 . 41)`

`= 9/11 - 9/41 + 1/(2^10 . 11) - 1/(2^10 . 41)`

`= 9/11 - 9/41 + 1/11 . 1/2^10 - 1/2^10 . 1/41`

`= 1/2^10 . (1/11 - 1/41) + (9/11 - 9/41)`

`= 1/2^10 . (1/11 - 1/41) + 9/(1/11 - 1/41)`

`= (1/2^10 + 9)(1/11 - 1/41)`

`= (1/2^10 + 9) . 30/451`

`-----`

Tính đến hết:

`= (1/1024 + 9) . 30/451`

`= (1/1024 + 9216/1024) . 30/451`

`= 9217/1024 . 30/451`

`= 46085/76971`

               $\color{#1c1c1c}{\text{I}}$$\color{#363636}{\text{t}}$$\color{#4f4f4f}{\text{s}}$$\color{#696969}{\text{m}}$$\color{#828282}{\text{e}}$$\color{#9c9c9c}{\text{F}}$$\color{#b5b5b5}{\text{r}}$$\color{#cfcfcf}{\text{e}}$$\color{#eee9e9}{\text{d}}$