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a) Ta có \(\frac{{ - 2}}{3} < 0\) và \(\frac{1}{{200}} > 0\) nên \(\frac{{ - 2}}{3}\)<\(\frac{1}{{200}}\).
b) Ta có: \(\frac{{139}}{{138}} > 1\) và \(\frac{{1375}}{{1376}} < 1\) nên \(\frac{{139}}{{138}}\) > \(\frac{{1375}}{{1376}}\).
c) Ta có: \(\frac{{ - 11}}{{33}} = \frac{{ - 1}}{3}\) và \(\frac{{25}}{{ - 76}} = \frac{{ - 25}}{{76}} > \frac{{ - 25}}{{75}} = \frac{{ - 1}}{3}\,\,\,\, \Rightarrow \frac{{25}}{{ - 76}} > \frac{{ - 11}}{33}\).
a: -2/3<0<1/200
b: 139/138>1
1375/1376<1
=>139/138>1375/1376
c: -11/33=-1/3=-25/75<-25/76
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{11}{33}=\dfrac{11}{3.11}=\dfrac{1}{3}\)
\(\dfrac{25}{76}< \dfrac{25}{75}=\dfrac{1}{3}\)
\(\Rightarrow\dfrac{11}{33}>\dfrac{25}{76}\)
\(\Rightarrow-\dfrac{11}{33}< -\dfrac{25}{76}\)
\(\Rightarrow\dfrac{-11}{33}< \dfrac{25}{-76}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
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b] \(\frac{127}{-128}>-1\)\(;\)\(\frac{-1345}{1244}< -1\)
\(\Rightarrow\frac{127}{-128}>-1>\frac{-1345}{1244}\Rightarrow\frac{127}{-128}>\frac{-1345}{1244}\)
c]\(\frac{-11}{33}=\frac{-1}{3}\)\(;\)\(\frac{25}{-76}>\frac{25}{-75}=\frac{-1}{3}\)\(\Rightarrow\frac{-11}{33}=\frac{-1}{3}< \frac{25}{-76}\Rightarrow\frac{-11}{33}< \frac{25}{-76}\)
d] \(\frac{-171717}{232323}=\frac{-17\times10101}{23\times10101}=\frac{-17}{23}\)\(\Rightarrow\frac{-17}{23}=\frac{-171717}{232323}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(-\frac{11}{25}>-\frac{25}{25}\) ; \(-\frac{25}{25}>-\frac{25}{124}\)
Suy ra \(-\frac{11}{25}>-\frac{25}{124}\)
11/-25 =-1364/3100
-25/124=-625/3100
do -1364/3100<-625/3100 suy ra 11/-25<-25/124
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{-11}{33}=-\frac{1}{3}\)
\(\frac{25}{-76}>-\frac{25}{75}=-\frac{1}{3}\)
\(\Rightarrow\frac{-11}{33}< \frac{25}{-76}\)
\(\frac{-11}{33}< \frac{25}{-76}\)
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