a)  ( -18/91) < (-18/90)=-1/5

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

Vậy -18/91 < -23/114

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

  \(\text{ Ta có :}\)\(\frac{18}{91}< \frac{18}{90}=\frac{1}{5}=\frac{23}{115}< \frac{23}{114}\)

   \(\text{Do đó : }\)\(\frac{-18}{91}>\frac{-23}{114}\)

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

       \(\text{Ta có :}\)\(\frac{22}{35}=\frac{110}{175}>\frac{103}{125}>\frac{103}{177}\)

      \(\text{Do đó :}\)\(\frac{-22}{35}< \frac{-103}{177}\)

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:

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

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

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

b)\(\frac{-22}{35}>\frac{-103}{107}\)

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

Ta có:

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

Ta có:

Chúc bạn học tốt!