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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) \(\frac{-18}{91}\) 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!
\(\text{a)}\)\(\frac{-18}{91}\)\(\text{và}\)\(\frac{-23}{114}\)
\(\text{ Ta có :}\)\(\frac{18}{91}< \frac{18}{90}=\frac{1}{5}=\frac{23}{115}< \frac{23}{114}\)
\(\text{Do đó : }\)\(\frac{-18}{91}>\frac{-23}{114}\)
\(\text{b)}\)\(\frac{-22}{35}\)\(\text{và}\)\(\frac{-103}{177}\)
\(\text{Ta có :}\)\(\frac{22}{35}=\frac{110}{175}>\frac{103}{125}>\frac{103}{177}\)
\(\text{Do đó :}\)\(\frac{-22}{35}< \frac{-103}{177}\)
a. \(\dfrac{-18}{91}\) và \(\dfrac{-23}{114}\)
\(\dfrac{18}{91}< \dfrac{18}{90}=\dfrac{1}{5}=\dfrac{23}{115}< \dfrac{23}{114}\)
\(\Rightarrow\dfrac{-18}{91}>\dfrac{-23}{114}\)
b. \(\dfrac{-22}{35}\) và \(\dfrac{-103}{177}\)
\(\dfrac{22}{35}=\dfrac{110}{175}>\dfrac{103}{175}>\dfrac{103}{177}\)
\(\Rightarrow\dfrac{-22}{35}< \dfrac{-103}{177}\)