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UK ĐÂY TOÁN 6 ĐÓ

bằng nhau nha

Có \(2004A=\frac{2014^{2015}+2014}{2014^{2015}+1}=\frac{2014^{2015}+1+2013}{2014^{2015}+1}=1+\frac{2013}{2014^{2015}+1}\)

 \(2014B=\frac{2014^{2014}+2014}{2014^{2014}+1}=\frac{2014^{2014}+1+2013}{2014^{2014}+1}=1+\frac{2013}{2014^{2014}+1}\)

 Vì \(\frac{2013}{2014^{2015}+1}< \frac{2013}{2014^{2014}+1}\)

=> \(1+\frac{2013}{2014^{2015}+1}< 1+\frac{2013}{2014^{2014}+1}\)

=> \(A< B\)

SDFGHJI

A=\(\dfrac{2013+2014}{2014+2015}=\dfrac{2013}{2014+2015}+\dfrac{2014}{2014+2015}\)

B=\(\dfrac{2013}{2014}+\dfrac{2014}{2015}\)

Vì \(\dfrac{2013}{2014}>\dfrac{2013}{2014+2015}\); \(\dfrac{2014}{2015}>\dfrac{2014}{2014+2015}\) nên B>A

\(A=\frac{2^{2014}+1}{2^{2014}}=\frac{2^{2014}}{2^{2014}}+\frac{1}{2^{2014}}=1+\frac{1}{2^{2014}}\)

\(B=\frac{2^{2014}+2}{2^{2014}+1}=\frac{2^{2014}+1+1}{2^{2014}+1}=\frac{2^{2014}+1}{2^{2014}+1}+\frac{1}{2^{2014}+1}=1+\frac{1}{2^{2014}+1}\)

Ta có: \(\frac{1}{2^{2014}}>\frac{1}{2^{2014}+1}\)

\(\Rightarrow1+\frac{1}{2^{2014}}>1+\frac{1}{2^{2014}+1}\)

\(\Rightarrow\frac{2^{2014}+1}{2^{2014}}>\frac{2^{2014}+2}{2^{2014}+1}\)

\(\Rightarrow A>B\)

Tham khảo nhé ~ 

A= 2^2014+1/2^2014 

B= 2^2014+2/2^2014+1

vì 1/2^2014<2/2^2014+1

=> A<B

cái này nhìn là bt mà ko cần chứng minh phức tạp lắm đâu bn nhìn một tí là làm dc ngay

\(A=\frac{2^{2014}+1}{2^{2014}}=\frac{2^{2014}}{2^{2014}}+\frac{1}{2^{2014}}=1+\frac{1}{2^{2014}}\)

\(B=\frac{2^{2014}+2}{2^{2014}+1}=\frac{2^{2014}+1+1}{2^{2014}+1}=\frac{2^{2014}+1}{2^{2014}+1}+\frac{1}{2^{2014}+1}=1+\frac{1}{2^{2014}+1}\)

Vì \(2^{2014}< 2^{2014}+1\Rightarrow\frac{1}{2^{2014}}>\frac{1}{2^{2014}+1}\Rightarrow1+\frac{1}{2^{2014}}>1+\frac{1}{2^{2014}+1}\) hay A > B

Vậy A > B

A=1-1/(2013*2014)

B=1-1/(2014*2015)

2013*2014<2014*2015

=>1/2013*2014>1/2014*2015

=>-1/2013*2014<-1/2014*2015

=>A<B