\(\frac{-27}{35}\)và\(\frac{-21}{40}\)
Quy đồng lên ta được: \(\frac{-27}{35}=\frac{\left(-27\right).8}{35.8}=\frac{-216}{280}\)và\(\frac{-21}{40}=\frac{\left(-21\right).7}{40.7}=\frac{-147}{280}\)
Mà \(\frac{-216}{280}< \frac{-147}{280}\)\(\Rightarrow\frac{-27}{35}< \frac{-21}{40}\)
\(\frac{-22}{45}\)và\(\frac{-17}{33}\)
Quy đồng lên ta được: \(\frac{-22}{45}=\frac{\left(-22\right).11}{45.11}=\frac{-242}{495}\)và\(\frac{-17}{33}=\frac{\left(-17\right).15}{33.15}=\frac{-255}{495}\)
Mà\(\frac{-242}{495}>\frac{-255}{495}\)\(\Rightarrow\frac{-22}{45}>\frac{-17}{33}\)
