Có: \(\left(\dfrac{-1}{2}\right)^{11}=-\left(\dfrac{1}{2}\right)^{11}\);\(\left(\dfrac{-1}{2}\right)^{13}=-\left(\dfrac{1}{2}\right)^{13}\)
Vì \(\left(\dfrac{1}{2}\right)^{11}< \left(\dfrac{1}{2}\right)^{13}\) nên \(\left(\dfrac{-1}{2}\right)^{11}>\left(\dfrac{-1}{2}\right)^{13}\)