a) \(1=\frac{45}{46}+\frac{1}{46}\)

    \(1=\frac{2011}{2012}+\frac{1}{2012}\)

Vì \(\frac{1}{46}>\frac{1}{2012}\)\(\Rightarrow\)\(\frac{45}{46}< \frac{2011}{2012}\)

b)Vì 2010/2011 < 1 và 17/16 > 1 => 2010/2011 < 17/16

a,

\(\frac{45}{46}>\frac{2011}{2012}\)

b,

\(\frac{2010}{2011}< \frac{17}{16}\)

Hok tốt!

\(a,\frac{45}{46}\)và \(\frac{2011}{2012}\)

Ta có: \(1-\frac{45}{46}=\frac{1}{46};1-\frac{2011}{2012}=\frac{1}{2012}\)

\(\frac{1}{46}>\frac{1}{2012}\Rightarrow\frac{45}{46}>\frac{2011}{2012}\)

\(b,\frac{2010}{2011}\)và \(\frac{17}{16}\)

Ta có: \(\frac{2010}{2011}< 1;\frac{17}{16}>1\Rightarrow\frac{2010}{2011}< \frac{17}{16}\)

a, 45/46 > 2011/2012

b, 2010 < 17/16

\(\dfrac{2010}{2011}\) và \(\dfrac{2011}{2012}\)

Ta có:

\(1-\dfrac{2010}{2011}=\dfrac{1}{2011}\)

\(1-\dfrac{2011}{2012}=\dfrac{1}{2012}\)

Vì \(\dfrac{1}{2011}>\dfrac{1}{2012}\) nên \(\dfrac{2010}{2011}< \dfrac{2011}{2012}\)

20112010​ và 2011201220122011​

Ta có:

1−20102011=120111−20112010​=20111​

1−20112012=120121−20122011​=20121​

Vì 12011>1201220111​>20121​ nên 20102011<2011201220112010​<20122011​

ta có: 1 - 2010/2011= 2011/2011 - 2010/2011=1/2011

           1 - 2011/2012= 2012/2012 - 2011/2012= 1/2012

   Vì 1/2011>1/2012

   Nên 2010/2011>2011/2012

17/35 < 28/31

Ta có: \(\frac{17}{35}< \frac{17}{31}< \frac{28}{31}\)

\(\Rightarrow\frac{17}{35}< \frac{28}{31}\)

cảm ơn mọi người

ta có:19/20<20/20 và 20/20<20/21

ta có:1-17/21=21/21-17/21=4/21 

                                               nên 4/21>4/27

         1-23/27=27/27=4/27

ta có:31/29-1=31/29-29/29=2/29

                                                nên 31/29>45/43

        45/43-1=43/43-45/43=2/43

nhớ k mình nha

Ta có: 18/46 = 18 x 45/46 x 45 = 810/2070 ; 21/45 = 21 x 46/45 x 46 = 966/2070

Nếu: 810/2070   <   966/2070

Vậy: 18/46     <     21/45

Hok tốt

k nha

Ta có : 18/46 < 18/45 < 21/45

Nên : 18/46< 21/45

Mình ko biết trình bày . sorry