Cách viết khác : \(\frac{16}{81}=\frac{2^4}{3^4}=\left(\frac{2}{3}\right)^4\)
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\(\left(\frac{16}{81}\right)=\left(\frac{2}{3}\right)^4\)
\(\frac{16}{81}=\left(\frac{-4}{-9}\right)^2=\left(\frac{2^2}{3^2}\right)^2=\left(\frac{\left(-2\right)^4}{\left(-3\right)^4}\right)=...\)
\(\dfrac{16}{81}\) \(=\) \(\left(\dfrac{2}{3}\right)^4\)