Question

Tính bằng cách hợp lí : \(\dfrac{2.6^9-2^5.18^4}{2^2.6^8}\)

Answer 1

Ta có:\(\dfrac{2.6^9-2^5.18^4}{2^2.6^8}=\dfrac{2^{10}.3^9-2^9.3^8}{2^{10}.3^8}=\dfrac{2^9.3^8.\left(2.3-1\right)}{2^{10}.3^8}=\dfrac{2^9.3^8.5}{2^{10}.3^8}=\dfrac{5}{2}\)