Ta có :\(2005\frac{2005}{2007}

a) Ta có:\(\frac{2005}{2007}=1-\frac{2}{2007}\)    \(;\)\(\frac{2007}{2009}=1-\frac{2}{2009}\)

Do\(\frac{2}{2007}>\frac{2}{2009}\Rightarrow1-\frac{2}{2007}< 1-\frac{2}{2009}\Rightarrow\frac{2005}{2007}< \frac{2007}{2009}\)

b) Ta có: \(\frac{2010}{2007}=1+\frac{3}{2007}\)\(;\)\(\frac{2007}{2004}=1+\frac{3}{2004}\)

Do\(\frac{3}{2007}< \frac{3}{2004}\Rightarrow1+\frac{3}{2007}< 1+\frac{3}{2004}\Rightarrow\frac{2010}{2007}< \frac{2007}{2004}\)

+ 2005/2007 = 1 - 2/2007

2007/2009 = 1 - 2/2009

Vì 2/2007 > 2/2009

=> 1 - 2/2007 < 1 - 2/2009

=> 2005/2007 < 2007/2009

+ 2010/2007 = 1 + 3/2007

2007/2004 = 1 + 3/2004

Vì 3/2007 < 3/2004

=> 1 + 3/2007 < 1 + 3/2004

=> 2010/2007 < 2007/2004

cảm ơn nha

eeeeeeeeeeeeeeeeeeeeeeeeee

Ta có:

\(\dfrac{1119}{1999}=1-\dfrac{880}{1999}\)

\(\dfrac{1999}{2000}=1-\dfrac{1}{2000}\) 

Mà: \(\dfrac{1}{2000}< \dfrac{880}{1999}\)

\(\Rightarrow1-\dfrac{880}{1999}< 1-\dfrac{1}{2000}\)

\(\Rightarrow\dfrac{1119}{1999}< \dfrac{1999}{2000}\)

Lấy 1 trử đi 2 vế ý

Xog so sánh

hi lu bn hi hi lu bn lop may 

a) 12/17 và 7/15

=>180/255 và 119/225

=>12/17<7/15

b)1999/2001 và 12/11

a) 

\(1-\frac{1998}{1999}=\frac{1}{1999}\)

\(1-\frac{1999}{2000}=\frac{1}{2000}\)

Vì \(\frac{1}{1999}>\frac{1}{2000}\)nên \(\frac{1998}{1999}< \frac{1999}{2000}\)

b) Ta có :

\(\frac{1999}{2001}< 1\)

\(\frac{12}{11}>1\)

Nên \(\frac{1999}{2001}< \frac{12}{11}\)

c) 

\(1-\frac{13}{27}=\frac{14}{27}\)

\(1-\frac{27}{41}=\frac{14}{41}\)

Vì \(\frac{14}{27}>\frac{14}{41}\)nên \(\frac{13}{27}< \frac{27}{41}\)

d) 

Ta có phân số trung gian là \(\frac{23}{45}\).

Ta có : \(\frac{23}{47}< \frac{23}{45}\) ; \(\frac{24}{45}>\frac{23}{45}\)

Nên \(\frac{23}{47}< \frac{24}{45}\)

có ai trả lời mik ko 

ai trả lời được mik liền

Ta có : \(1=\frac{1998}{1999}+\frac{1}{1999}\)

         \(1=\frac{1}{2000}+\frac{1999}{2000}\)

Mà \(\frac{1}{2000}< \frac{1}{1999}\)

Nên \(\frac{1999}{2000}>\frac{1998}{1999}\)