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P/S : hơi dài ahihi
\(\frac{2.6^9-2^5.18^4}{2^2.6^8}\)\(=\frac{2.2^9.3^9-2^5.2^4.3^8}{2^2.2^8.3^8}\)\(=\frac{2^{10}.3^9-2^9.3^8}{2^{10}.3^8}\)\(=\frac{2^9.3^8\left(2.3-1\right)}{2^{10}.3^8}\)\(=\frac{2^9.3^8.5}{2^{10}.3^8}\)
\(=\frac{5}{2}=2,5\)