Question

Tính nhanh

\(\dfrac{4^5.9^4-2.6^9}{2^{10}.3^8-6^8.20}\)

Answer 1

\(\dfrac{4^5.9^4-2.6^9}{2^{10}.3^8-6^8.20}=\dfrac{\left(2^2\right)^5.\left(3^2\right)^4-2.2^9.3^9}{2^{10}.3^8-3^8.2^8.2^2.5}\\ =\dfrac{2^{10}.3^8-2^{10}.3^9}{2^{10}.3^8-3^8.2^{10}.5}=\dfrac{2^{10}.3^8\left(1-3\right)}{2^{10}.3^8\left(1-5\right)}=\dfrac{-2}{-4}=\dfrac{2}{4}=\dfrac{1}{2}\)

Answer 2

\(\dfrac{4^5.9^4-2.6^9}{2^{10}.3^8-6^8.20}=\dfrac{\left(2^2\right)^5.\left(3^2\right)^4-2.2^9.3^9}{2^{10}.3^8-3^8.2^8.2^2.5}\)

\(=\dfrac{2^{10}.3^8-2^{10}.3^9}{2^{10}.3^8-3^8.2^{10}.5}=\dfrac{2^{10}.3^8\left(1-3\right)}{2^{10}.3^8\left(1-5\right)}=\dfrac{2}{4}=\dfrac{1}{2}\)

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