Rút gọn biểu thức sau: $\frac{10^{4}.81-16.15^{2} }{4^{4}.675}$

$\frac{10^4.81-16.15^2}{4^4.675}=$ $\frac{2^4.5^4.3^4-2^4.3^2.5^2}{2^8.5^2.3^3}=$ $\frac{2^4.5^2.3^2.(5^2.3^2-1)}{2^8.5^2.3^3}=$ $\frac{224}{2^4.3}=$ $\frac{14}{3}$