(0,8)5/(0,4)6
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
(0,8)⁵ : (0,4)⁶
= (4/5)⁵ : (2/5)⁶
= 1024/3125 : 64/15625
= 16 . 5
= 80
\(\left(0,8\right)^5:\left(0,4\right)^6\\ =\left(\dfrac{4}{5}\right)^5:\left(\dfrac{2}{5}\right)^6\\ =\dfrac{1024}{3125}:\dfrac{64}{15625}\\ =16.5\\ =80\)
![](https://rs.olm.vn/images/avt/0.png?1311)
(0,8)\(^5\) : (0,4)\(^6\) = ((0,2)\(^3\))\(^5\) : ((0,2)\(^2\))\(^6\) = (0,2)\(^{15}\) : (0,2)\(^{12}\) = (0,2)\(^3\) = 0,8
\(\left(0,8\right)^5:\left(0,4\right)^6=\left(\dfrac{4}{5}\right)^5.\left(\dfrac{5}{2}\right)^6=\dfrac{2^8}{5^5}.\dfrac{5^6}{2^6}=\dfrac{4}{1}.\dfrac{5}{1}=20\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{0,8^5}{0,4^6}=\dfrac{\left(2^3\cdot\dfrac{1}{10}\right)^5}{\left(2^2\cdot\dfrac{1}{10}\right)^6}=\dfrac{2^{15}\cdot\dfrac{1}{10^5}}{2^{12}\cdot\dfrac{1}{10^6}}=\dfrac{2^3}{\dfrac{1}{10}}=2^3\cdot10=80\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{\left(0,8\right)^5}{\left(0,4\right)^6}=\dfrac{\left(0,4.2\right)^5}{\left(0,4\right)^6}=\dfrac{\left(0,4\right)^5.2^5}{\left(0,4\right)^6}=\dfrac{2^5}{0,4}=\dfrac{32}{0,4}=80\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{\left(0,8\right)^5}{\left(0,4\right)^6}=\frac{\left(0,8\right)^5}{\left(0,4\right)^5}\times\frac{1}{0,4}=\left(\frac{0,8}{0,4}\right)^5\times\frac{5}{2}=2^5\times\frac{5}{2}=2^4\times5=16\times5=80\)
bạn ơi , tại sao \(\frac{0,8^5}{0,4^6}\)bằng \(\frac{0,8^5}{0,4^5}\)vậy ?
![](https://rs.olm.vn/images/avt/0.png?1311)
\(=\left(\dfrac{0,8}{0,4}\right)^5\cdot\dfrac{1}{0,4}=2^5\cdot\dfrac{1}{0,4}=\dfrac{32}{0,4}=80\)
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
![](https://rs.olm.vn/images/avt/0.png?1311)
( 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 !!!
![](https://rs.olm.vn/images/avt/0.png?1311)
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) \(\dfrac{2^{15}\cdot9^4}{6^6\cdot8^3}\)
\(=\dfrac{2^{15}\cdot\left(3^2\right)^4}{2^6\cdot3^6\cdot\left(2^3\right)^3}\)
\(=\dfrac{2^{15}\cdot3^8}{2^{15}\cdot3^6}\)
\(=\dfrac{3^2}{1}\)
\(=9\)