a) ta có:  \(1-\frac{2012}{2013}=\frac{1}{2013}\)

                 \(1-\frac{2013}{2014}=\frac{1}{2014}\)

mà \(\frac{1}{2013}>\frac{1}{2014}\) nên   \(\frac{2013}{2014}>\frac{2012}{2013}\)

sao giống lớp 4 thế ta

Ta có:

\(\frac{2}{5}=\frac{8}{20};\frac{4}{2}=\frac{40}{20};\frac{6}{2}=\frac{60}{20};\frac{9}{4}=\frac{45}{20};\frac{5}{4}=\frac{25}{20}\)

Vì \(\frac{8}{20}

8/20 nhaaaaaaaaaaa

8/20 nha

-11/15>-1

-19/7<-1

-23/-27>-1

-2012/1994<-1

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

2/7<4/9

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

Tk mk mk tk lại ! ^^ 

a.>

b.<

c.<

\(\dfrac{4}{5}>\dfrac{4}{5}\)

\(\dfrac{8}{15}< \dfrac{11}{15}\)

\(\dfrac{3}{8}< \dfrac{5}{9}\)

>

<

>

\(\dfrac{2011\cdot2012}{2011\cdot2012+1}=\dfrac{2011\cdot2012+1-1}{2011\cdot2012+1}=1-\dfrac{1}{2011\cdot2012+1}\)

\(\dfrac{2012\cdot2013}{2012\cdot2013+1}=\dfrac{2012\cdot2013+1-1}{2012\cdot2013+1}=1-\dfrac{1}{2012\cdot2013+1}\)

Ta có: \(2011\cdot2012< 2012\cdot2013\)

=>\(2011\cdot2012+1< 2012\cdot2013+1\)

=>\(\dfrac{1}{2011\cdot2012+1}>\dfrac{1}{2012\cdot2013+1}\)

=>\(-\dfrac{1}{2011\cdot2012+1}< \dfrac{-1}{2012\cdot2013+1}\)

=>\(\dfrac{-1}{2011\cdot2012}+1< \dfrac{-1}{2012\cdot2013+1}+1\)

=>\(\dfrac{2011\cdot2012}{2011\cdot2012+1}< \dfrac{2012\cdot2013}{2012\cdot2013+1}\)

12/27 < 1
216/306 < 1

94/72 > 1

111/333 < 1

101/404 < 1
51/ 17 > 1

nè

- Các phân số bé hơn 1 là:

- Các phân số lớn hơn 1 là:

- Phân số:= 1