M>N              

\(N=\frac{2004+2005}{2005+2006}=\frac{2004}{2005+2006}+\frac{2005}{2005+2006}\)

\(\text{Vì }\frac{2004}{2005}>\frac{2004}{2005+2006};\frac{2005}{2006}>\frac{2005}{2005+2006}\text{nên:}\)

\(\frac{2004}{2005}+\frac{2005}{2006}>\frac{2004}{2005+2006}+\frac{2005}{2005+2006}\)

Vậy M>N

\(\frac{2004}{2005}>0,5\); \(\frac{2005}{2006}>0,5\)nên \(\frac{2004}{2005}+\frac{2005}{2006}>1\)

\(\frac{2004+2005}{2005+2006}\)có hai số hạng ở tử số nhỏ hơn 2 số hạng ở mẫu số => \(\frac{2004+2005}{2005+2006}\frac{2004+2005}{2005+2006}\)

A>B chúc bạn học tốt

a)A = B

b)A>B

$A=\frac{{2005}^{2005}+1}{{2005}^{2006}+1}<\frac{{2005}^{2005}+1+2004}{{2005}^{2006}+1+2004}=\frac{2005.({2005}^{2004}+1)}{2005.({2005}^{2005}+1)}==\frac{{2005}^{2004}+1}{{2005}^{2005}+1}=B.$

Vậy A < B

$A=\frac{{2005}^{2005}+1}{{2005}^{2006}+1}<\frac{{2005}^{2005}+1+2004}{{2005}^{2006}+1+2004}=\frac{2005.({2005}^{2004}+1)}{2005.({2005}^{2005}+1)}==\frac{{2005}^{2004}+1}{{2005}^{2005}+1}=B.$

Vậy A < B

$A=\frac{{2005}^{2005}+1}{{2005}^{2006}+1}<\frac{{2005}^{2005}+1+2004}{{2005}^{2006}+1+2004}=\frac{2005.({2005}^{2004}+1)}{2005.({2005}^{2005}+1)}==\frac{{2005}^{2004}+1}{{2005}^{2005}+1}=B.$

Vậy A < B

CHÚC HỌC TỐT VÀ ĐỪNG QUÊN TICK NHA

2004 /2005*(+2005) /2006 < 2004*(+2005) /2005 +2006

\(10A=\frac{2005^{2006}+10}{2005^{2006}+1}\)

\(10B=\frac{2005^{2005}+10}{2005^{2005}+1}\)

Rồi bạn so sánh 10A và 10B là ra.

Ai thấy đúng thì ủng hộ nha !!!, sai thì góp ý cho mink nha 

Ta có

A <\(\frac{2005^{2005}+2005}{2005^{2006}+2005}=\frac{2005\left(2005^{2004}+1\right)}{2005\left(2005^{2005}+1\right)}\)=\(\frac{2005^{2004}+1}{2005^{2005}+1}\)

\(\RightarrowĐPCM\)

\(A=\frac{2005.\left(2005^{2005}+1\right)}{2005^{2006}+1}=\frac{2005^{2006}+2005}{2005^{2006}+1}=\frac{2005^{2006}+1+2004}{2005^{2006}+1}=1+\frac{2004}{2005^{2006}+1}\)

\(B=\frac{2005.\left(2005^{2004}+1\right)}{2005^{2005}+1}=\frac{2005^{2005}+2005}{2005^{2005}+1}=\frac{2005^{2005}+1+2004}{2005^{2005}+1}=1+\frac{2004}{2005^{2005}+1}\)

Vì  \(2005^{2005}+1< 2005^{2006}+1\)

\(\Rightarrow\frac{2004}{2005^{2005}+1}>\frac{2004}{2005^{2006}+1}\Rightarrow2005B>2005A\Rightarrow B>A\)

\(M=\frac{2004}{2005}+\frac{2005}{2006}\)

\(\Rightarrow M>\frac{2004}{2006+2005}+\frac{2005}{2005+2006}\)

\(\Rightarrow M>\frac{2004+2005}{2005+2006}=N\)

\(\Rightarrow M>N\)