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![](https://rs.olm.vn/images/avt/0.png?1311)
Cách viết khác : \(\frac{16}{81}=\frac{2^4}{3^4}=\left(\frac{2}{3}\right)^4\)
Chúc bạn học tốt ^^
![](https://rs.olm.vn/images/avt/0.png?1311)
Lời giải :
Ta có :
\(\frac{16}{81}\)\(=\)\(\left(\frac{4}{9}\right)^2\)\(=\)\(\left(\frac{-4}{9}\right)^2\)\(=\)\(\left(\frac{2}{3}\right)^4\)\(=\)\(\left(\frac{-2}{3}\right)^4\)
![](https://rs.olm.vn/images/avt/0.png?1311)
0,25 = (0,5)2
\(\dfrac{1}{49}\) = (\(\dfrac{1}{7}\))2
- \(\dfrac{27}{125}\) = (- \(\dfrac{3}{5}\))3
\(\dfrac{81}{16}\) = ( \(\dfrac{9}{4}\))2
\(\dfrac{169}{196}\) = (\(\dfrac{13}{14}\))2
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{16}{81}=\frac{4^2}{9^2}=\left(\frac{4}{9}\right)^2\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{16}{81}=\left(\frac{-4}{9}\right)^2=\left(\frac{4^2}{3^2}\right)=\left(\frac{\left(-4\right)^2}{\left(-3\right)^2}\right)=....\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{81}{625}=\frac{9^2}{25^2}=\left(\frac{9}{25}\right)^2\)
\(\frac{81}{625}=\frac{3^4}{5^4}=\left(\frac{3}{5}\right)^4\)
`81/625 = (9^2)/(25^2) = (9/25)^2`
`81/625 = (3^4)/(5^4) = (3/5)^4`
\(\frac{16}{81}=\frac{4^2}{9^2}=\left(\frac{4}{9}\right)^2\)
\(\frac{16}{81}=\frac{4^2}{9^2}=\left(\frac{4}{9}\right)^2\)
P/s : Học tốt !