a)\(\dfrac{-11}{13}<\dfrac{...}{13}<\dfrac{...}{13}<\dfrac{...}{13}<\dfrac{-7}{13};\)
Vì \(-11 < -10 < -9 < -8 < -7\) nên:
\(\dfrac{-11}{13}<\dfrac{-10}{13}<\dfrac{-9}{13}<\dfrac{-8}{13}<\dfrac{-7}{13}\) .
b) \(\dfrac{-1}{3}<\dfrac{...}{36}<\dfrac{...}{18}<\dfrac{-1}{4}.\)
Quy đồng mẫu các phân số ta có: \(\dfrac{-12}{36}<\dfrac{...}{36}<\dfrac{...}{36}<\dfrac{-9}{36}.\)
Vì \(-12 < -11 < -10 < -9\) nên ta có:
\(\dfrac{-12}{36}<\dfrac{-11}{36}<\dfrac{-10}{36}<\dfrac{-9}{36}\) hay \(\dfrac{-1}{3}<\dfrac{-11}{36}<\dfrac{-5}{18}<\dfrac{-1}{4}.\)
