Vì \(\dfrac{25}{67}< \dfrac{25}{89}:\dfrac{25}{89}< \dfrac{35}{89}=>\dfrac{25}{67}< \dfrac{35}{89}\)

2567<2589:2589<3589=>2567<3589

ai mà biết ?

\(\dfrac{4}{7}v\text{à }\dfrac{16}{63}\\ \dfrac{4}{7}=\dfrac{4\cdot9}{7\cdot9}=\dfrac{36}{63}\\ \dfrac{36}{63}>\dfrac{16}{63}\\ \Rightarrow\dfrac{4}{7}>\dfrac{16}{36}\) 

\(\dfrac{4}{17}\) và \(\dfrac{16}{63}\)

\(\dfrac{4}{63}>\dfrac{16}{63}\)

\(=>\dfrac{4}{17}>\dfrac{16}{63}\)

\(\dfrac{5}{29}\) và \(\dfrac{7}{33}\)

\(\dfrac{5}{33}< \dfrac{7}{33}\)

\(=>\dfrac{5}{29}< \dfrac{7}{33}\)

\(\dfrac{44}{57}\) và \(\dfrac{89}{99}\)

\(\dfrac{44}{99}< \dfrac{89}{99}\)

\(=>\dfrac{44}{57}< \dfrac{89}{99}\)

\(\dfrac{19}{53}\) và \(\dfrac{30}{73}\)

\(\dfrac{19}{73}>\dfrac{30}{73}\)

\(=>\dfrac{19}{53}>\dfrac{30}{73}\)

Ta có:

4/17<4/16=1/4

16/63>16/64=1/4

Do 4/17<1/4<16/63 

Nên 16/63>4/17

Ta co:

\(\frac{58}{89}< \frac{58}{87}=\frac{2}{3}=\frac{36}{54}< \frac{36}{53}\)

Hay :\(\frac{58}{89}< \frac{36}{53}hay\frac{36}{53}>\frac{58}{89}\)
 

\(\frac{2}{7}\)\(< \)\(\frac{4}{9}\)

2/7<4/9

\(\frac{2}{7}< \frac{4}{9}\)

Tk mk mk tk lại ! ^^ 

Ta có : \(\dfrac{-23}{91}>\dfrac{-131}{91}\\ \dfrac{-131}{91}>\dfrac{-131}{535}\\ nên\dfrac{-131}{535}>\dfrac{-23}{91}\)

Ta có : 17/40 < 17/37 <18/37

Suy ra 17/40 < 18/37

a: so sánh với 1

64/85 < 73/81

b: so sánh với 1 

n + 1/n+2 > n/ n+3

c: so sánh với 1

64/65 > 60/61

d: so sánh với 1

99/97 < 88/86