Gợi ý nhé: bạn hãy so sánh 2014A và 2014B rồi suy ngược lại A và B

Ta có:

2014A=2014²⁰¹⁴+ 2014/2014²⁰¹⁴+1=1+2013/2014²⁰¹⁴+1

2014B=2014²⁰¹³+2014/2014²⁰¹³+1=1+2013/2014²⁰¹³+1

vì 1+2013/2014²⁰¹⁴+1<1+2013/2014²⁰¹³+1 nên 10A < 10B

suy ra A<B

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

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

so sánh \(\frac{1}{2^{2014}}\) và \(\frac{1}{2^{2014}+1}\)

ta có

\(2^{2014}<2^{2014}+1\) 

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

ta thấy:

2^2014<2^2014+2

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

vậy......

Có : 2²⁰¹⁴ + 1 > 2²⁰¹⁴ nên \(\frac{2^{2014}+1}{2^{2014}}\)> 1 .

2²¹⁰⁴ + 1 < 2²⁰¹⁴ + 2 nên \(\frac{2^{2014}+1}{2^{2014}+2}\)< 1.

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

1 cách dễ hơn nè:

Có 2²⁰¹⁴+1 = 2²⁰¹⁴ + 1 ( tử và tử bằng nhau )

2²⁰¹⁴<2²⁰¹⁴+2

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

Đặt :

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

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

\(1+\frac{1}{2^{2014}}>1+\frac{1}{2^{2014}+2}\Leftrightarrow A>B\)

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

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

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

Nên A > B 

Viết hẳn từng bước đi bạn

Được thôi ban :

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

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

Đó ok chưa 

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

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

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

Đặt A= 2015^2013+1/2015^2014+7, B=2015^2014-2/2015^2015-2

2015A= 2015^2014+2015/2015^2014+7= 1 + (2008/2015^2014+7)

2015B= 2015^2015-4030/2015^2015-2= 1 - (4028/2015^2015-2)

Do 2015A>1>2015B nên A>B