Ta có: 

\(\frac{5}{2};\frac{7}{4}>1\) ; \(\frac{4}{5};\frac{7}{10}< 1\)

Mà \(\frac{5}{2}=\frac{10}{4}>\frac{7}{4}\); \(\frac{4}{5}=\frac{8}{10}>\frac{7}{10}\)

\(\Rightarrow\frac{5}{2}>\frac{7}{4}>\frac{4}{5}>\frac{7}{10}\)

Vậy ta sắp xếp \(\frac{5}{2};\frac{7}{4};\frac{4}{5};\frac{7}{10}\)

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

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

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

\(1,\frac{7}{5},\frac{15}{14},\frac{5}{7},\frac{1}{2},\frac{2}{5}\)

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 : \(-\dfrac{3}{4};-\dfrac{7}{12};-\dfrac{5}{12};-\dfrac{1}{3};\dfrac{1}{-4}\)

a, 9; 7; 5; 2

b, 1; 6; 4; 8

a) 9, 7, 5 2

b) 1, 4, 6, 8

a. 9-7-5-2

b. 1-4-6-8

giải giúp mình mình cần gấp!!!

=> 5/6; 4/5; 2/3; 7/12; 1/2

                                1/2    ; 4/5    ; 2/3   ; 5/6     ; 7/12

Khi quy đồng ta có: 30/60; 48/60; 40/60; 50/60; 35/60

\(\dfrac{1}{2}=\dfrac{1\cdot24}{2\cdot24}=\dfrac{24}{48}\)

\(\dfrac{3}{48}=\dfrac{3\cdot1}{48\cdot1}=\dfrac{3}{48}\)

\(\dfrac{8}{12}=\dfrac{8\cdot4}{12\cdot4}=\dfrac{32}{48}\)

\(\dfrac{5}{6}=\dfrac{5\cdot8}{6\cdot8}=\dfrac{40}{48}\)

\(\dfrac{7}{12}=\dfrac{7\cdot4}{12\cdot4}=\dfrac{28}{48}\)

mà 3<24<28<32<40

nên \(\dfrac{3}{48}< \dfrac{1}{2}< \dfrac{7}{12}< \dfrac{8}{12}< \dfrac{5}{6}\)

3/48,1/2;7/12;8/12;5/6

3/48, 1/2, 7/12, 8/12, 5/6
hk tốt

Bé đến lớn :: 7/9  ,   5/6   ,    5/4      ,     21/5

Lớn đến bé : 3/2   ,   5/4   ,   7/10     ,     3/5