Giải:
\(27^5.9^4=\left(3^3\right)^5.\left(3^2\right)^8=3^{15}.3^8=3^{23}\)
\(\left(\dfrac{1}{8}\right)^{10}:\left(\dfrac{1}{16}\right)^4=\left(\dfrac{1}{2}^3\right)^{10}:\left(\dfrac{1}{2}^4\right)^4=\left(\dfrac{1}{2}\right)^{30}:\left(\dfrac{1}{2}\right)^{16}=\left(\dfrac{1}{2}\right)^{14}\)
Chúc bạn học tốt!