Question

\(\dfrac{2.6^9-2^5.18^4}{2^2.6^8}\) Giúp mình với ạ

Answer 1

\(\dfrac{2\cdot6^9-2^5\cdot18^4}{2^2\cdot6^8}\)

\(=\dfrac{2\cdot2^9\cdot3^9-2^5\cdot2^4\cdot3^8}{2^2\cdot2^8\cdot3^8}\)

\(=\dfrac{2^{10}\cdot3^9-2^9\cdot3^8}{2^{10}\cdot3^8}=\dfrac{2^9\cdot3^8\left(2\cdot3-1\right)}{2^{10}\cdot3^8}\)

\(=\dfrac{1}{2}\cdot5=\dfrac{5}{2}\)