-7/9;-5/6;13/20;11/15;50/41

-7/9;-5/6;13/20;11/15;50/41

3/8 ; 1/2 ; 5/7 ; 14/4 nha

\(A=\dfrac{2}{3}+\dfrac{-1}{3}=\dfrac{1}{3}\\ B=\dfrac{25}{11}\times\dfrac{13}{12}\times\dfrac{-11}{5}=\dfrac{5\times13\times\left(-1\right)}{1\times12\times1}=\dfrac{-65}{12}\\ C=\left(\dfrac{3}{4}-\dfrac{1}{5}\right)\times\left(\dfrac{2}{5}-\dfrac{4}{5}\right)=\dfrac{11}{20}\times\dfrac{-2}{5}=\dfrac{-11}{50}\)

\(B< -1< C< 0< A\\ \Leftrightarrow B< C< A\)

1/4 , 3/2 = 6/4 , 1 , 1/2 = 2/4

nên 1/4 , 2/4 , 1, 6/4

\(\dfrac{1}{4};\dfrac{6}{4};\dfrac{4}{4};\dfrac{2}{4}\)

\(=>\dfrac{1}{4}< \dfrac{2}{4}< \dfrac{4}{4}< \dfrac{6}{4}\)

0<\(\dfrac{1}{5}\) <\(\dfrac{1}{3}\) <\(\dfrac{3}{4}\) <1<\(\dfrac{4}{3}\) <2<\(\dfrac{5}{2}\) <\(\dfrac{6}{2}\)

`MSC:12`

`1/3 = (1xx4)/(3xx4)= 4/12`

`3/2=(3xx6)/(2xx6)=18/12`

`5/6=(5xx2)/(6xx2)=10/12`

`3/4=(3xx3)/(4xx3)=9/12`

`-> 4/12; 9/12; 10/12;18/12`

`->1/3; 3/4;5/6;3/2`

có `1/3=4/12`

`3/2=18/12`

`5/6=10/12`

`3/4=9/12`

vì `4<9<10<18`

`=>4/12<9/12<10/12<18/12`

`=>1/3<3/4<5/6<3/2`

`=>` sắp xếp: `1/3;3/4;5/6;3/2`

goi a,b,c la 3 chu so ti le voi 1;2;3 

a/1=b/2=c/3 va a+b+c=18

Ap dung tinh chat day ti so bang nhau : 

a/1=b/2=c/3=a+b+c/1+2+3=18/6=3

Suy ra :a/1=3=>a=3

b/2=3=>b=6

c/3=3=>c=9

bấm đc mà, chắc bn bị lối á