Ta co

\(\frac{12}{25}\frac{12}{25}\Rightarrow\frac{25}{49}>\frac{12}{25}\)

Ta có:25.25>12.49

=>\(\frac{25.25}{25.49}>\frac{12.49}{25.49}\Rightarrow\frac{25}{49}>\frac{12}{25}\)

12/25>25/49

Ta có : 

\(\frac{12}{25}< \frac{12}{29}\)

             \(\frac{12}{29}< \frac{25}{29}\)

=> \(\frac{12}{25}< \frac{12}{29}< \frac{25}{29}\)

Vậy \(\frac{12}{25}< \frac{25}{29}\)

\(\frac{12}{25}< \frac{25}{49}\)

TA CÓ 12*2=24<25, 2582=50>49

=>12/25<25/49

Ta có:

\(\frac{12}{25}< \frac{12}{24}=\frac{1}{2}\Rightarrow\frac{12}{25}< \frac{1}{2}\left(1\right)\)

\(\frac{25}{49}>\frac{25}{50}=\frac{1}{2}\Rightarrow\frac{25}{49}>\frac{1}{2}\left(2\right)\)

Từ \(\left(1\right)\)và\(\left(2\right)\)\(\Rightarrow\)\(\frac{12}{25}< \frac{1}{2}< \frac{25}{49}\)\(\Rightarrow\frac{12}{25}< \frac{25}{49}\)

NHỚ TK MK NHA

\(\frac{12}{25}\)= 12: 25 0,48 

\(\frac{25}{49}\)= 0,510..........

=> 0,48 < 0,510 => \(\frac{12}{25}\)<    \(\frac{25}{49}\)

Ta co:

   12/25 = 24/50 < 24/49 < 25/49

   => 12/25 < 25/49

12/25 > 25/49

Ta có:

\(\frac{25}{12}>\frac{24}{12}=2\)

\(\frac{49}{25}< \frac{50}{25}=2\)

Vì  \(\frac{25}{12}>2>\frac{49}{25}\) nên  \(\frac{25}{12}>\frac{49}{25}\)

Chúc bạn học tốt!

12/25 < 25/49

13/15 > 133/155

câu 1 : quy đồng 2 ps ta đc : \(\frac{621}{756},\frac{672}{756}\) mà \(\frac{621}{756}

a) Có : 23/27>22/27

Mà 22/27>22/29

=> 23/27>22/29

b) Có : 12/25=24/50

24/50<24/49;24/49<25/49

=> 12/25<25/49

a,23/27>23/29

22/29<23/29

=>22/29<23/29<23/27

=>22/29<23/27

kl:....(kết luận)