(0,8)⁵ : (0,4)⁶

= (4/5)⁵ : (2/5)⁶

= 1024/3125 : 64/15625

= 16 . 5

= 80

\(\left(0,8\right)^5:\left(0,4\right)^6\\ =\left(\dfrac{4}{5}\right)^5:\left(\dfrac{2}{5}\right)^6\\ =\dfrac{1024}{3125}:\dfrac{64}{15625}\\ =16.5\\ =80\)

\(\left(0,8\right)^5\):\(\left(0,4\right)^6\)

=0,32768:0,004096

=80

(0,8)^5/(0,4)^6=80

\(\dfrac{0,8^5}{0,4^6}=\dfrac{\left(2^3\cdot\dfrac{1}{10}\right)^5}{\left(2^2\cdot\dfrac{1}{10}\right)^6}=\dfrac{2^{15}\cdot\dfrac{1}{10^5}}{2^{12}\cdot\dfrac{1}{10^6}}=\dfrac{2^3}{\dfrac{1}{10}}=2^3\cdot10=80\)

\(\dfrac{\left(0,8\right)^5}{\left(0,4\right)^6}=\dfrac{\left(0,4.2\right)^5}{\left(0,4\right)^6}=\dfrac{\left(0,4\right)^5.2^5}{\left(0,4\right)^6}=\dfrac{2^5}{0,4}=\dfrac{32}{0,4}=80\)

\(\frac{\left(0,8\right)^5}{\left(0,4\right)^6}=\frac{\left(0,8\right)^5}{\left(0,4\right)^5}\times\frac{1}{0,4}=\left(\frac{0,8}{0,4}\right)^5\times\frac{5}{2}=2^5\times\frac{5}{2}=2^4\times5=16\times5=80\)

\(\frac{0,8^5}{0,4^6}=\frac{0,8^5}{0,4^5.\left(0,4\right)}=\left(\frac{0,8}{0,4}\right)^5.\left(0,4\right)=32.\left(0,4\right)=\frac{64}{5}\)\(\frac{0,8^5}{0,4^6}=\frac{0,8^5}{0,4^5.\left(0,4\right)}=\left(\frac{0,8}{0,4}\right)^5.\left(0,4\right)=32.\left(0,4\right)=\frac{64}{5}\)

\(=\left(\dfrac{0,8}{0,4}\right)^5\cdot\dfrac{1}{0,4}=2^5\cdot\dfrac{1}{0,4}=\dfrac{32}{0,4}=80\)

Giải:

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

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

= \(2^5.\dfrac{1}{0,4}\)

= \(\dfrac{32}{0,4}=80\)

Hok tốt 

Tính giá trị biểu thức

\(\dfrac{2^{15}.9^4}{6^3.8^3}\)

                      ( 0,8 )⁵ / ( 0,4 )⁶ = ( 0,4 x 2 )⁵ / ( 0,4 )⁶ = ( 0,4 )⁵ x 2⁵ / ( 0,4 )⁶ = 32 / 0,4 = 80

                      Ủng hộ mk nha !!!

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

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

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

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

\(=9\)

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