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

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

Ta có; \(\frac{14}{105}=\frac{14:7}{105:7}=\frac{2}{15}=\frac{2\times7}{15\times7}=\frac{14}{105}\)

\(\frac{49}{280}=\frac{49:7}{280:7}=\frac{7}{40}=\frac{7\times2}{40\times2}=\frac{14}{80}\)

\(\frac{21}{126}=\frac{21:21}{126:21}=\frac16=\frac{1\times14}{6\times14}=\frac{14}{84}\)

\(\frac{7}{41}=\frac{7\times2}{41\times2}=\frac{14}{82}\)

Ta có: 80<82<84<105

=>\(\frac{14}{80}>\frac{14}{82}>\frac{14}{84}>\frac{14}{105}\)

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

-124/-2017;0;-24/35;-19/30;-5/9;-25/47;23/-49

tk mk nha, mk đg bị âm điểm

hi bạn 

25 phần 24 , 19 phần 18 , 21 phần 20 , 24 phần 23 , 18 phần 17

bài này bạn quy đồng rồi sắp xếp lại

A) \(\frac{17}{120}\) ; \(\frac{11}{72}\) ; \(\frac{7}{28}\) 

B) \(\frac{-31}{49}\) ; \(\frac{-62}{97}\) ; \(\frac{-63}{97}\) \(\frac{-93}{140}\) 

17/120 ;11/72 ; 7/28

-93/140 ; -63/97 ; -62/97 ; -31/49