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![](https://rs.olm.vn/images/avt/0.png?1311)
sắp xếp theo thứ tự tăng dần là:
\(\Rightarrow-\frac{2}{15};-\frac{1}{10};\frac{1}{6};\frac{1}{5};\frac{4}{15};\frac{1}{3}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a.\frac{-3}{5}< \frac{1}{-2}< \frac{-5}{-12}< \frac{2}{3}< \frac{3}{2}\)
\(b.\frac{6}{-5}< \frac{7}{-6}< \frac{9}{-10}< \frac{-2}{-5}< \frac{3}{4}\)
\(c.\frac{4}{-9}< \frac{-7}{21}< \frac{4}{-15}< \frac{8}{12}< \frac{24}{15}\)
Hok tốt :D
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có: \(\frac{5}{{ - 6}} = \frac{{ - 5}}{6} = \frac{{ - 5.5}}{{6.5}} = \frac{{ - 25}}{{30}}\)
\(\frac{{ - 2}}{5} = \frac{{ - 2.6}}{{5.6}} = \frac{{ - 12}}{{30}}\)
\( - 1 = \frac{{ - 30}}{{30}}\)
Do \(\frac{{ - 30}}{{30}} < \frac{{ - 25}}{{30}} < \frac{{ - 12}}{{30}}<0\) nên \( - 1 < \frac{5}{{ - 6}} < \frac{{ - 2}}{5}<0\)
Mặt khác, \(0 < \frac{3}{5} < 2\)
Sắp xếp theo thứ tự tăng dần:
\( - 1;\,\frac{5}{{ - 6}};\frac{{ - 2}}{5};\,0; \frac{3}{5}; \,2\).
\(2=\dfrac{120}{60};\dfrac{5}{-6}=\dfrac{-50}{60};\dfrac{3}{5}=\dfrac{36}{60};-1=-\dfrac{60}{60};-\dfrac{2}{5}=-\dfrac{24}{60};0=\dfrac{0}{60}\)
\(-60< -50< -24< 0< 36< 120\)
=>\(-1< -\dfrac{5}{6}< -\dfrac{2}{5}< 0< \dfrac{3}{5}< 2\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{-5}{6};\frac{2}{-3};\frac{-1}{8};\frac{-1}{-2}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{-3}{8}=\frac{-9}{24}\)\(;\frac{-7}{12}=\frac{-14}{24};\frac{2}{3}=\frac{16}{24};\frac{5}{6}=\frac{20}{24}\)
Các số xếp thừ bứ đến lớn là: \(\frac{-14}{24};\frac{-9}{24};\frac{16}{24};\frac{20}{24}\)
HT
\(\frac{-9}{24}\); \(\frac{-14}{24}\); \(\frac{16}{24}\); \(\frac{20}{24}\)
=>\(\frac{-14}{24}\); \(\frac{-9}{24}\); \(\frac{16}{24}\); \(\frac{20}{24}\)
=>\(\frac{-7}{12}\); \(\frac{3}{-8}\); \(\frac{2}{3}\); \(\frac{5}{6}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có:
\(\frac{{ - 2}}{5} = \frac{{ - 2.8}}{{5.8}} = \frac{{ - 16}}{{40}}\)
\(\frac{{ - 3}}{8} = \frac{{ - 3.5}}{{8.5}} = \frac{{ - 15}}{{40}}\)
\(\frac{3}{{ - 4}} = \frac{{ - 3}}{4} = \frac{{ - 3.10}}{{4.10}} = \frac{{ - 30}}{{40}}\)
Do -30 < -16 < -15 nên \(\frac{{ - 30}}{{40}} < \frac{{ - 16}}{{40}} < \frac{{ - 15}}{{40}}\). Do đó \(\frac{3}{{ - 4}} < \frac{{ - 2}}{5} < \frac{{ - 3}}{8}\).
-2/15;-1/10;1/6;1/5;4/15,1/3;-2/-5
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