Question

b) (0,8) mũ 5 / (0,4) mũ 6

c) 2 mũ 15 . 9 mũ 4 / 6 mũ 6 . 8 mũ 3

Answer 1

b) \(\dfrac{\left(0,8\right)^5}{\left(0,4\right)^6}\)

\(=\dfrac{\left(0,8\right)^5}{\left(0.4\right)^5\cdot0,4}\)

\(=\left(\dfrac{0,8}{0,4}\right)^5\cdot\dfrac{1}{0,4}\)

\(=2^5\cdot\dfrac{5}{2}\)

\(=\dfrac{2^5\cdot5}{2}\)

\(=2^4\cdot5\)

\(=80\)

c) \(\dfrac{2^{15}\cdot9^4}{6^6\cdot8^3}\)

\(=\dfrac{2^{15}\cdot\left(3^2\right)^4}{2^6\cdot3^6\cdot\left(2^3\right)^3}\)

\(=\dfrac{2^{15}\cdot3^8}{2^{15}\cdot3^6}\)

\(=\dfrac{3^2}{1}\)

\(=9\)

Answer 2

c) 2^15.9^466.83=2^15.3^8/2^6.3^6.2^9=3^2/1=9

dấu này / là phần  nha