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\(\frac{3^{11}\div5+3^{11}.3}{3^{10}.2^2}=\frac{3^{11}\cdot\frac{1}{5}+3^{11}\cdot3}{3^{10}.2^2}\)
\(=\frac{3^{11}.\left(\frac{1}{5}+3\right)}{3^{10}.2^2}=\frac{3^{11}.\frac{16}{5}}{3^{10}.2^2}=\frac{\frac{48}{5}}{2^2}=\frac{48}{5}\cdot\frac{1}{4}=\frac{12}{5}\)
\(\frac{1}{3^{10}}\div\frac{1}{9^5}=\frac{1}{3^{10}}\div\frac{1}{3^{10}}=1\)
a) \(\frac{3^7.16^3}{12^5.27^2}=\frac{3^7.\left(4^2\right)^3}{3^5.4^5.\left(3^3\right)^2}\)
\(=\frac{3^7.4^6}{3^5.4^5.3^6}\)
\(=\frac{3^7.4^6}{3^{11}.4^5}\)
\(=\frac{4}{3^4}=\frac{4}{81}\)
b) \(\frac{2^3.\left(\frac{1}{2}\right)^3.3^7}{2.\left(\frac{1}{2}\right)^4.3^8}\)
\(=\frac{4}{\frac{1}{2}.3}=\frac{4}{\frac{3}{2}}=\frac{8}{3}\)
c)\(\frac{10^3+5.10^2+5^3}{-13}\)
\(=\frac{10^2.\left(10+5\right)+125}{-13}\)
\(=\frac{100.15+125}{-13}\)
\(=\frac{1500+125}{-13}=\frac{1625}{-13}=-125\)
a) \(3^x=\frac{3^8}{3^9}=\frac{1}{3}=3^{-1}\)
\(\Rightarrow x=-1\)
Vậy x = -1
b) \(\frac{3^5}{3^x}=3^{10}\)
\(\Rightarrow3^5:3^x=3^{10}\)
\(\Rightarrow3^x=3^5:3^{10}\)
\(\Rightarrow3^x=\frac{1}{3^5}\)
\(\Rightarrow3^x=3^{-5}\)
\(\Rightarrow x=-5\)
Vạy x = -5
c) \(\left(-5\right)^x=\frac{25^{10}}{\left(-5\right)^{17}}\)
\(\Rightarrow\left(-5\right)^x=\frac{5^{20}}{\left(-5\right)^{17}}\)
\(\Rightarrow\left(-5\right)^x=\left(-5\right)^3\)
\(\Rightarrow x=3\)
Vậy x = 3
=(-2.5)^3:5^3
=-2^3.5^:5^3
=-2^3=-8