a: \(\frac{5}{12}=\frac{5\times21}{12\times21}=\frac{105}{252}\)

\(\frac{7}{18}=\frac{7\times14}{18\times14}=\frac{98}{252}\)

\(\frac{-8}{21}=\frac{-8\times12}{21\times12}=\frac{-96}{252}\)

\(\frac{-5}{14}=\frac{-5\times18}{14\times18}=\frac{-90}{252}\)

mà -96<-90<98<105

nên \(-\frac{8}{21}<-\frac{5}{14}<\frac{7}{18}<\frac{5}{12}\)

b: \(\frac{7}{41}=\frac{7\times42}{41\times42}=\frac{294}{1722}\)

\(\frac{14}{105}=\frac{14\times21}{105\times21}=\frac{294}{2205}\)

\(\frac{49}{280}=\frac{49\times6}{280\times6}=\frac{294}{1680}\)

\(\frac{21}{126}=\frac{21\times14}{126\times14}=\frac{294}{1764}\)

mà 1680<1722<1764<2205

nên \(\frac{294}{1680}>\frac{294}{1722}>\frac{294}{1764}>\frac{294}{2205}\)

=>\(\frac{49}{280}>\frac{7}{41}>\frac{21}{126}>\frac{14}{105}\)

a)2/3, 4/5,11/15

b)5/6,5/4,7/9,21/5

a) 9/7,3/2,17/14

b)3/2,5/4,7/10,3/5

lấy mt ra,quy đồng rùi sắp xếp như thường,có thek thui!!!!!!!!!!!!!!!!!!!!

a) 1/2
b) 18/17; 17/16; 16/15; 15/14; 14/13; 13/12; 10/9
Nhớ k cho mk nha

a)1/2

b)Vì 18/17 <17/16 <16/15<15/14< 14/13< 13/12< 10/9

Nên, ta có: 

18/17; 17/16; 16/15; 15/14; 14/13; 13/12; 10/9.

Các bạn giúp mình với mình đang cần gấp lắm

5/9;11/18;11/15;14/15

chac chan dung 100%

5/9;11/18;11/15;14/15
 

\(\dfrac{2}{3}< \dfrac{4}{5}< \dfrac{5}{6}< \dfrac{9}{10}< \dfrac{14}{15}\)

Thank you 

a)\(\dfrac{8}{15}< \dfrac{11}{15}< \dfrac{15}{15}< \dfrac{16}{15}< \dfrac{17}{15}< \dfrac{19}{15}\)

b)\(\dfrac{19}{42}< \dfrac{19}{35}< \dfrac{19}{21}< \dfrac{19}{19}< \dfrac{19}{17}\)

c)\(\dfrac{8}{10}< \dfrac{6}{7}< \dfrac{27}{25}< \dfrac{16}{14}\)

a) 8/15 ;  11/15 ; 15/15 ; 16/15 ; 17/15 ; 19/15

b) 19/42 19/35 ; 19/21 ; 19/19 ; 19/17

c) 8/10 ; 6/7 ; 27/25 ; 16/14

c#ẹp.c#ẹp.típ.k.

12/14 > 13/14 > 15/15 > 19/18 > 20/18

\(\dfrac{4}{13}\);\(\dfrac{6}{22}\);\(\dfrac{3}{14}\);\(\dfrac{2}{11}\)