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- Đặt \(A=\frac{8^4.3^5-4^6.9^3}{4^6.9^3+4^8.3^5}\)
- Ta có: \(A=\frac{\left(2^3\right)^4.3^5-\left(2^2\right)^6.\left(3^2\right)^3}{\left(2^2\right)^6.\left(3^2\right)^3+\left(2^2\right)^8.3^5}\)
\(\Leftrightarrow A=\frac{2^{12}.3^5-2^{12}.3^6}{2^{12}.3^6+2^{16}.3^5}\)
\(\Leftrightarrow A=\frac{2^{12}.3^5.\left(1-3\right)}{2^{12}.3^5.\left(3+2^4\right)}\)
\(\Leftrightarrow A=\frac{-2}{3+16}\)
\(\Leftrightarrow A=-\frac{2}{19}\)
Vậy \(A=-\frac{2}{19}\)
\(\frac{2^{19}.27^3+15.4^9.9^4}{6^9.2^{10}+12^{10}}\)
\(=\frac{2^{19}.3^9+3.5.2^{18}.3^8}{2^{19}.3^9+3^{10}.2^{20}}\)
\(=\frac{2^{19}.3^9.\left(2+5\right)}{2^{19}.3^9.\left(1+3.2\right)}\)
\(=\frac{7}{7}\)
\(=1\)
\(\frac{9^8.4^3}{27^4.6^5}=\frac{\left(3^2\right)^8.\left(2^2\right)^3}{\left(3^3\right)^4.2^5.3^5}=\frac{3^{16}.2^6}{3^{12}.2^5.3^5}=\frac{3^{16}.2^6}{3^{17}.2^5}=\frac{1.2}{3.1}=\frac{2}{3}\)