Question

Giúp mik vs m.n

Answer 1

b) \(\dfrac{9^4.27^5}{3^{11}}\)

\(=\dfrac{\left(3^2\right)^4.\left(3^3\right)^5}{3^{11}}\)

\(=\dfrac{3^8.3^{15}}{3^{11}}\)

\(=\dfrac{3^{23}}{3^{11}}\)

\(=3^{12}\)

Answer 2

c: Ta có: \(5^{x-3}=25\)

\(\Leftrightarrow x-3=2\)

hay x=5

d: Ta có: \(\left(-8\right)^x=\dfrac{1}{64}\)

\(\Leftrightarrow8^x=\dfrac{1}{8^2}\)

hay x=-2