6/15,7/7,12/15,13/6

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

\(\dfrac{12}{7};\dfrac{3}{2}\)

12/7 , 3/2

12 / 7 , 3 / 2

7/7 ; 1/7 ; 6/5; 5/2

1/7 ; 7/7 ; 6/5 ; 5/2

1/7 ; 7/7 ; 6/5 ; 5/2

3/4   1/2   3/7

3/4 1/2 

12/45=4/15=16/60;

35/60=35/60 

12/24=1/2=30/60

 6/15=2/5=24/60 

12/15=48/60

=>12/45<6/15<12/24<35/60<12/15<8/7

a: -10/8<-1

-19/19=-1

-1<-2/10<0

0<5/12<1<17/15

=>17/15>1>5/12>-2/10>-19/19>-10/8

b: -1/3=-4/12; -5/12=-5/12; -3/4=-9/12; -1/4=-3/12; -7/12=-7/12

=>-3/4<-7/12<-5/12<-1/3<-1/4

Theo thứ tự từ lớn đến bé:\(\dfrac{17}{15};1;\dfrac{5}{12};0;\dfrac{2}{-10};-\dfrac{19}{19};-\dfrac{10}{8}\)

Theo thứ tự từ bé đến lớn : \(-\dfrac{3}{4};-\dfrac{7}{12};-\dfrac{5}{12};-\dfrac{1}{3};\dfrac{1}{-4}\)

\(\dfrac{3}{7},\dfrac{2}{3},\dfrac{12}{12},\dfrac{7}{6}\)

các số từ bé đấn lớn là

\(\dfrac{3}{7};\dfrac{2}{3};\dfrac{12}{12};\dfrac{7}{6}\)