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2014+2015+2016/2015+2016+2017<2014/2015+2015/2016+2016/2017
A = \(\frac{2015^{2016}+1}{2015^{2015}+1}=\frac{2015^{2015}+1}{2015^{2015}+1}+\frac{2015}{2015^{2015}+1}=1+\frac{2015}{2015^{2015}+1}\)
B = \(\frac{2014^{2015}+1}{2014^{2014}+1}=\frac{2014^{2014}+1}{2014^{2014}+1}+\frac{2014}{2014^{2014}+1}=1+\frac{2014}{2014^{2014}+1}\)
Rồi bạn tự so sánh nha
\(A=\frac{2015}{2016}+\frac{2016}{2017}+\frac{2017}{2018}\)
\(B=\frac{2015+2016+2017}{2016+2017+2018}\)
\(B=\frac{2015}{2016+2017+2018}+\frac{2016}{2016+2017+2018}+\frac{2017}{2016+2017+2018}\)
Ta có:
\(\frac{2015}{2016}>\frac{2015}{2016+2017+2018}\)
\(\frac{2016}{2017}>\frac{2016}{2016+2017+2018}\)
\(\frac{2017}{2018}>\frac{2017}{2016+2017+2018}\)
Cộng vế theo vế, ta có:
\(\frac{2015}{2016}+\frac{2016}{2017}+\frac{2017}{2018}>\frac{2015}{2016+2017+2018}+\frac{2016}{2016+2017+2018}+\frac{2017}{2016+2017+2018}\)
\(hay\frac{2015}{2016}+\frac{2016}{2017}+\frac{2017}{2018}>\frac{2015+2016+2017}{2016+2017+2018}\)
\(\Rightarrow A>B\)
Vậy A > B
\(y=\frac{2014}{\frac{2015}{\frac{2015}{2016}}}=\frac{2014}{2015}.\frac{2015}{2016}=\frac{1007}{1008}=1-\frac{1}{2008}\)
\(\frac{2014}{2015}=1-\frac{1}{2015}\)
Vì \(\frac{1}{2008}>\frac{1}{2015}\)nên \(\frac{1007}{1008}< \frac{2014}{2015}\)
Vậy A>y
Ta có : P = 2014/2015 + 2015/2016 + 2016/2017 < 2014/(2015+2016+2017) + 2015/(2015+2016+2017) + 2016/(2015+2016+2017) = Q
Suy ra : P < Q
Vậy P < Q.
Ta thấy:\(\frac{2014}{2015}+\frac{2015}{2016}+\frac{2016}{2017}\)>\(\frac{2014+2015+2016}{2015+2016+2017}\)
Vậy :P>Q
Ta có: \(\frac{2015}{-2014}=-\frac{2015}{2014}=-\left(1+\frac{1}{2014}\right)\)\(=-1-\frac{1}{2014}\)
\(\frac{-2016}{2015}=-\frac{2016}{2015}=-\left(1+\frac{1}{2015}\right)\)\(=-1-\frac{1}{2015}\)
Do \(\frac{1}{2014}\) > \(\frac{1}{2015}\) => \(\frac{2015}{-2014}\) < \(\frac{-2016}{2015}\)
\(\frac{2015}{2014}-1=\frac{1}{2014};\frac{2016}{2015}-1=\frac{1}{2015}\)
Vì\(\frac{1}{2014}>\frac{1}{2015}\Leftrightarrow\frac{2015}{2014}>\frac{2016}{2015}\)
\(A=\frac{2015}{2014}=1+\frac{1}{2014}\)
\(B=\frac{2016}{2015}=1+\frac{1}{2015}\)
Vì \(\frac{1}{2014}>\frac{1}{2015}\)nên \(A>B\)