b: \(\left(\dfrac{1}{9}\right)^{17}=\left(\dfrac{1}{3}\right)^{34}\)
\(\left(\dfrac{1}{27}\right)^{12}=\left(\dfrac{1}{3}\right)^{36}\)
mà 34<36
nên \(\left(\dfrac{1}{9}\right)^{17}< \left(\dfrac{1}{27}\right)^{12}\)
c: \(\left(-27\right)^{27}=\left(-3\right)^{81}\)
\(\left(-243\right)^{13}=\left(-3\right)^{65}\)
Do đó: \(\left(-27\right)^{27}< \left(-243\right)^{13}\)