10^9 x 81^10 ----------------------------- 8^4 x 25^5 x 9^10

Đáp án:

$\dfrac{3^{20}}{40}$.

Giải thích các bước giải:

$\dfrac{10^9.81^{10}}{8^4.25^5.9^{10}}\\=\dfrac{\left(2.5\right)^9.\!\left(3^4\right)^{10}}{\left(2^3\right)^4.\!\left(5^2\right)^5.\!\left(3^2\right)^{10}}\\=\dfrac{2^9.5^9.3^{40}}{2^{12}.5^{10}.3^{20}}\\=\dfrac{3^{20}}{2^3.5}\\=\dfrac{3^{20}}{40}$