a)  ( -18/91) < (-18/90)=-1/5

-23/114 > -23/115= -1/5

Vậy -18/91 < -23/114

a, \(\frac{-22}{35}>\frac{-22}{177}>\frac{-103}{177}\)

=>\(\frac{-22}{35}>\frac{103}{177}\)

b, \(\frac{-17}{23}>\frac{-17}{31}>\frac{-25}{31}\)

=>\(\frac{-17}{23}>\frac{-25}{31}\)

Chúc bạn học giỏi nha!!!

K cho mik vs nhé Nguyễn Mai

a) Phân số trung gian là: \(\frac{-103}{35}\)

Ta có: \(\frac{-22}{35}>\frac{-103}{35}>\frac{-103}{177}\Rightarrow\frac{-22}{35}>\frac{-103}{177}\)

b) Phân số trung gian là: \(\frac{-25}{23}\)

Ta có: \(\frac{-17}{23}>\frac{-25}{23}>\frac{-25}{31}\Rightarrow\frac{-17}{23}>\frac{-25}{31}\)

a) \(\frac{-18}{91}\) và \(\frac{-23}{114}\)

\(\frac{-18}{91}=\frac{-18.114}{91.114}=\frac{-2052}{\text{10374}}\) 

\(\frac{-23}{114}=\frac{-23.91}{114.91}=\frac{\text{-2093}}{10374}\)

Ta có:

\(\frac{-2052}{10374}< \frac{-2093}{10374}\)

\(\Rightarrow\)\(\frac{-18}{91}< \frac{-23}{114}\)

b) \(\frac{-22}{35}\) và \(\frac{-103}{177}\)

\(\frac{-22}{35}=\frac{-22.177}{35.177}=\frac{\text{-3894}}{\text{6195}}\)

\(\frac{-103}{177}=\frac{-103.35}{177.35}=\frac{\text{-3605}}{6195}\)

Ta có:

\(\frac{-3894}{6195}< \frac{-3605}{6195}\)

\(\Rightarrow\)\(\frac{-22}{35}< \frac{-103}{177}\)