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7 tháng 3 2016

\(A=\frac{4^5.9^4-2.6^9}{2^{10}.3^8+6^8.20}\)=\(\frac{2^{10}.3^8-2.2^9.3^9}{2^{10}.3^8+2^8.3^8.2^2.5}=\frac{2^{10}.3^8-2^{10}.3^8.3}{2^{10}.3^8+2^{10}.3^8.5}\)

          \(=\frac{2^{10}.3^8\left(1-3\right)}{2^{10}.3^8\left(1+5\right)}=-\frac{2}{6}=-\frac{1}{3}\)

20 tháng 9 2020

45 . 94 - 2 . 69/210 . 38 + 68 . 20\(=\frac{\left(2^2\right)^5.\left(3^2\right)^4-2.\left(2.3\right)^9}{2^{10}.3^8+\left(2.3\right)^8.2^2.5}=\frac{2^{10}.3^8-2.2^9.3^9}{2^{10}.3^8+2^{10}.3^8.5}\)\(=\frac{2^{10}.3^8.\left(1-3\right)}{2^{10}.3^8.\left(1+5\right)}=\frac{-2}{6}=\frac{-1}{3}\)

Viết lại đề bài ik bn 

8 tháng 1 2019

mình ko biết cách viết phân số

27 tháng 2 2018

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

\(=\dfrac{\left(2^2\right)^5.\left(3^2\right)^4-2.\left(2.3\right)^9}{2^{10}.3^8+\left(2.3\right)^8.2^2.5}\)

\(=\dfrac{2^{10}.3^8-2^{10}.3^9}{2^{10}.3^8+2^{10}.3^8.5}\)

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

\(=\dfrac{-1}{3}\)

19 tháng 8 2018

\(\frac{4^5.9^4-2.6^9}{2^{10}.3^6.20}=\frac{2^{10}.3^8-2.2^9.3^9}{2^{10}.3^6.2^2.5}=\frac{2^{10}.\left(3^8-3^9\right)}{2^{12}.3^6.5}=\frac{3^8-3^9}{2^2.3^6.5}=\frac{3^7\left(3-3^2\right)}{2^2.3^6.5}=\frac{3.\left(-6\right)}{20}\)\(=\frac{-18}{20}=\frac{-9}{10}\)

19 tháng 8 2018

\(\frac{4^5\cdot9^4-2\cdot6^9}{2^{10}\cdot3^6\cdot20}\)

\(=\frac{2^{10}\cdot3^8-2^{10}\cdot3^9}{2^{12}\cdot3^6\cdot5}\)

\(=\frac{2^{10}\cdot3^8\cdot\left(1-3\right)}{2^{12}\cdot3^6\cdot5}\)

\(=\frac{3^2\cdot\left(-2\right)}{2^2\cdot5}\)

\(=\frac{-9}{10}\)

14 tháng 8 2018

\(B=\dfrac{9^3}{3^6.4}\)\(=\dfrac{\left(3^2\right)^3}{3^6.4}=\dfrac{3^6}{3^6.4}=\dfrac{1}{4}\)

\(C=\dfrac{4^5.9^4-2.6^9}{2^{10}.3^8+6^8.20}=\dfrac{\left(2^2\right)^5.\left(3^2\right)^4-2.\left(2.3\right)^9}{2^{10}.3^8+\left(2.3\right)^8.2^2.5}=\dfrac{2^{10}.3^8-2^{10}.3^9}{2^{10}.3^8+2^{10}.3^8.5}=\dfrac{\left(2^{10}.3^8\right)\left(1-3\right)}{\left(2^{10}.3^8\right)\left(1+5\right)}=\dfrac{-2}{6}=\dfrac{-1}{3}\)