\(\frac{252525}{373737}=\frac{252525:10101}{373737:10101}=\frac{25}{37}\)

\(\frac{272727}{353535}=\frac{272727:10101}{353535:10101}=\frac{27}{35}>\frac{27}{37}>\frac{25}{37}\)

vậy \(\frac{252525}{373737}

\(\frac{252525}{373737}=\frac{25.10101}{37.10101}=\frac{25}{37}=\frac{875}{1295}\)

\(\frac{272727}{353535}=\frac{27.10101}{35.10101}=\frac{27}{35}=\frac{999}{1295}\)

Vì \(\frac{875}{1295}

\(\frac{252525}{373737}=\frac{252525:10101}{373737:10101}=\frac{25}{37};\frac{272727}{353535}=\frac{272727:10101}{353535:10101}=\frac{27}{35}\)

=>25/37<27/35

thì bn quy đòng mẫu số hai phân số ra

rùi xem p/s nào có tử số lớn hơn thì lớn hơn 

\(\frac{181818}{242424}=\frac{181818:10101}{242424:10101}=\frac{18}{24}=\frac{18:6}{24:6}=\frac{3}{4}\)

\(\frac{181818}{242424}=\frac{181818\div10101}{242424\div10101}=\frac{18}{24}\)

\(\frac{252525}{353535}=\frac{252525\div10101}{353535\div10101}=\frac{25}{35}\)

Ta có : \(\frac{18}{24}=\frac{18\times35}{24\times35}=\frac{630}{840};\frac{25}{35}=\frac{25\times24}{35\times24}=\frac{600}{840}\)

Vì \(\frac{630}{840}>\frac{600}{840}\)nên \(\frac{181818}{242424}>\frac{252525}{353535}\)

\(\frac{45}{27}\)  >    \(\frac{494949}{353535}\)

Vì rút gọn 2 p/s này ta đc : \(\frac{5}{3}\)và \(\frac{7}{5}\)

So sánh : \(\frac{5}{3}\)> \(\frac{7}{5}\)( quy đồng mẫu số ) 

Nên ...............................

\(\text{So sánh :}\)

\(\frac{45}{27}\text{ và }\frac{494949}{353535}\)

\(\text{Ta có :}\)

\(\frac{45}{27}=\frac{45\text{ : }9}{27\text{ : }9}=\frac{5}{3}\)

\(\frac{494949}{353535}=\frac{494949\text{ : }10101}{353535\text{ : }10101}=\frac{49}{35}=\frac{7}{5}\)

\(\Rightarrow\frac{5}{3}=\frac{5\cdot5}{3\cdot5}=\frac{25}{15}\)

\(\Rightarrow\frac{7}{5}=\frac{7\cdot3}{5\cdot3}=\frac{21}{15}\)

\(\text{Vì : }\frac{25}{15}>\frac{21}{15}\text{ nên }\frac{45}{27}>\frac{494949}{353535}\)

45/27= 5/3

494949/353535= (49x 10101)/(35x10101)=49/35=7/5

5/3= 25/15

7/5= 21/15

mà 25/15>21/15 nên suya ra 45/27>494949/353535

Bạn nào cho mk 1 ik, mk cho bn ý 3 ik luôn. Mk hứa nếu nói dối bạn có thể Báo cáo sai phạm mk.

45/27.............................49/35

quy đồng là ra ( hoặc tìm phân số trung gian)

k nhé

17/35 và 171717/353535                                                                    

Rút gọn: 171717/353535=171717:10101/353535:10101=17/35.          

Mà 17/35=17/35                                                                                  

171717/353535=17/35 

1/ Ta có : \(\frac{212121}{353535}=\frac{3.7.10101}{5.7.10101}=\frac{3}{5}=\frac{42}{70}\)

\(\frac{131313}{141414}=\frac{13.10101}{14.10101}=\frac{13}{14}=\frac{65}{70}\)

Vì 42 < 65 =>  \(\frac{42}{70}<\frac{65}{70}\)  =>  \(\frac{212121}{353535}<\frac{131313}{141414}\)