121212/131313 = 12/13 

=> 12/13 < 12/ 18 

Vậy .......... 

k mình nha

121212/131313

=12/13

12/13>12/18

=> 121212/131313>12/18

k minh nha

\(\frac{121212}{131313}\)=\(\frac{121212:10101}{131313:10101}=\frac{12}{13}\)< \(\frac{12}{18}\)

Ta có:121212/131313=12/13<12/18

hok tốt!

#miu

                                        Đ/S : <

ta có : 121212/131313=12/13<12/18

hok tốt ! 

#miu

\(\dfrac{121212}{131313}=\dfrac{121212:10101}{131313:10101}=\dfrac{12}{13}\)

6/7 < 121212/131313

TL

\(\frac{6}{7}< \frac{121212}{131313}\)

nha bn

HT

TL :

Ta có : 121212/131313 = 12/13

Lại có : 6/7 = 78/91

12/13 = 84/91

Mà 78/91 < 84/91

=> 6/7 < 121212/131313

HT

\(\dfrac{1313}{1717}=\dfrac{101x13}{101x17}=\dfrac{13}{17}\)

\(\dfrac{131313}{171717}=\dfrac{10101x13}{10101x17}=\dfrac{13}{17}\)

Vậy \(\dfrac{1313}{1717}=\dfrac{131317}{171717}\)

\(\dfrac{1313}{1717}và\dfrac{131313}{171717}\\ \dfrac{1313}{1717}=\dfrac{13}{17}\\ \dfrac{131313}{171717}=\dfrac{13}{17}\\ \Rightarrow\dfrac{1313}{1717}=\dfrac{131313}{171717}\)

1313/1717=131313/171717

tôi ko qui đồng đâu đấy nha 

13/27>16/33

k mình nha

Sai đề rồi  ghf diepio

de la the do

a)\(\frac{18}{91}\)<   \(\frac{23}{114}\)       ;     b)    \(\frac{1313}{9191}\) <    \(\frac{1111}{7373}\)

a)\(\frac{18}{91}\)\(< \)\(\frac{23}{114}\)

b)\(\frac{1313}{9191}\)\(< \)\(\frac{1111}{7373}\)

Ta có :

\(\frac{1313}{9191}\)= \(\frac{1}{7}\)= \(\frac{11}{77}\)

\(\frac{1111}{7373}\)= \(\frac{11}{73}\)

Vì \(\frac{11}{77}\)< \(\frac{11}{73}\)( 77>73)

=> \(\frac{1313}{9191}\)> \(\frac{1111}{7373}\)

\(\frac{1313}{9191}=\frac{1}{7}=\frac{1.11}{7.11}=\frac{11}{77}\)

\(\frac{1111}{7373}=\frac{11}{73}\)

\(\Rightarrow\frac{11}{77}< \frac{11}{73}\Rightarrow\frac{1313}{9191}>\frac{1111}{7373}\)