1. \(\frac{7}{39}=\frac{140}{780};\frac{11}{65}=\frac{132}{780};\frac{9}{52}=\frac{135}{780}\) và thứ tự tăng dần là : \(\frac{132}{780}< \frac{135}{780}< \frac{140}{780}\)

2. \(\frac{17}{20}=\frac{153}{180};-\frac{19}{30}=-\frac{114}{180};\frac{38}{45}=\frac{152}{180};-\frac{13}{10}=-\frac{130}{180}\) và thứ tự tăng dận là : 

\(-\frac{130}{180}< -\frac{114}{180}< \frac{152}{180}< \frac{153}{180}\)

.

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 \(\frac{3}{{ - 4}} < \frac{{ - 2}}{5} < \frac{{ - 3}}{8}\).

\(\frac{-3}{8}=\frac{-9}{24}\)\(;\frac{-7}{12}=\frac{-14}{24};\frac{2}{3}=\frac{16}{24};\frac{5}{6}=\frac{20}{24}\)

Các số xếp thừ bứ đến lớn là: \(\frac{-14}{24};\frac{-9}{24};\frac{16}{24};\frac{20}{24}\)

HT

\(\frac{-9}{24}\); \(\frac{-14}{24}\); \(\frac{16}{24}\); \(\frac{20}{24}\)

=>\(\frac{-14}{24}\); \(\frac{-9}{24}\); \(\frac{16}{24}\); \(\frac{20}{24}\)

=>\(\frac{-7}{12}\); \(\frac{3}{-8}\); \(\frac{2}{3}\); \(\frac{5}{6}\)

k đúng cho mik đc ko

Bài 1: 

a: 3/4=54/72

-1/9=-8/72

-5/8=-45/72

b: -1/7=-8/56

-1/-8=1/8=7/56

3/4=42/56

3/5=36/60;3/4=45/60;7/12=35/60

35/60<36/60<45/60 nên 7/12<3/5<3/4

\(\dfrac{3}{5}=\dfrac{36}{60};\dfrac{3}{4}=\dfrac{45}{60};\dfrac{7}{12}=\dfrac{35}{60}\\ \dfrac{35}{60}< \dfrac{36}{60}< \dfrac{45}{60}\Rightarrow\dfrac{7}{12}< \dfrac{3}{5}< \dfrac{3}{4}\)

3/-8=-9/24

-7/12=-14/24

2/3=16/24

5/6=20/24

Vay ta sap xep nhu sau:-7/12;-3/8;2/3;5/6

nho k cho minh voi nha

3/4=45/60

3/5=36/60

7/12=35/60

sắp sếp:35/60;36/60;45/60

hay:7/12;3/5;3/4