a: \(\dfrac{-18}{91}>\dfrac{-18}{90}=\dfrac{-1}{5}\)

\(\dfrac{-23}{114}< \dfrac{-23}{115}=\dfrac{-1}{5}\)

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

b: \(\dfrac{-22}{35}=\dfrac{-3894}{6195}\)

\(\dfrac{-103}{177}=\dfrac{-103\cdot35}{177\cdot35}=\dfrac{-3605}{6195}\)

mà -3894<-3605

nên -22/35<-103/177

a)  ( -18/91) < (-18/90)=-1/5

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

Vậy -18/91 < -23/114

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. \(\dfrac{-18}{91}\) và \(\dfrac{-23}{114}\) ( mẫu chung : 10374 )

Quy đồng : \(\dfrac{-18}{91}=\dfrac{-2052}{10374}\) ; \(\dfrac{-23}{114}=\dfrac{-2093}{10374}\)

Vì \(\dfrac{-2052}{10374}>\dfrac{-2093}{10374}\Rightarrow\dfrac{-18}{91}>\dfrac{-23}{114}\)

Vậy...

b. \(\dfrac{-22}{35}\) và \(\dfrac{-103}{177}\) ( MC = 6195 )

Quy đồng : \(\dfrac{-22}{35}=\dfrac{-3894}{6195};\dfrac{-103}{177}=\dfrac{-3605}{6195}\)

Vì \(\dfrac{-3894}{6195}< \dfrac{-3605}{6195}\Rightarrow\dfrac{-22}{35}< \dfrac{-103}{177}\)

Vậy...

c. \(\dfrac{-22}{45}\) và \(\dfrac{-17}{33}\)(MC=495)

Quy đồng : \(\dfrac{-22}{45}=\dfrac{-242}{495};\dfrac{-17}{33}=\dfrac{-255}{495}\)

Vì \(\dfrac{-242}{495}>\dfrac{-255}{495}\Rightarrow\dfrac{-22}{45}>\dfrac{-17}{33}\)

Vậy

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!