5 mũ 10 . 7 mũ 3 - 25 mũ 5 . 49 mũ 2 / ( 125 . 7) mũ 3 +5 mũ 9 . 14 mũ 3

`(5^10 . 7^3 - 25^5 . 49^2)/((125 . 7)^3 + 5^9 . 14^3)`

`= (5^10 . 7^3 - (5^2)^5 . (7^2)^2)/(125^3 . 7^3 + 5^9 . 7^3 . 2^3)`

`= (5^10 . 7^3 - (5^2)^5 . (7^2)^2)/((5^3)^3 . 7^3 + 5^9 . 7^3 . 2^3)`

`= (5^10 . 7^3 - (5^2)^5 . (7^2)^2)/((5^3)^3 . 7^3 + 5^9 . 7^3 . 2^3)`

`= (5^10 . 7^3 - 5^10 . 7^4)/(5^9 . 7^3 + 5^9 . 7^3 . 2^3)`

`= (5^9 . 5 . 7^3 - 5^9 . 5 . 7^3 . 7)/(5^9 . 7^3 + 5^9 . 7^3 . 2^3)`

`= (\cancel(5^9) . 5 . \cancel(7^3) - \cancel(5^9) . 5 . \cancel(7^3) . 7)/(\cancel(5^9) . \cancel(7^3) + \cancel(5^9) . \cancel(7^3) . 2^3)`

`= (5.(-7))/(2^3)`

`= -35/8`