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Ta có
(m+n+p)^q >= m^q+n^q+p^q
=>a+b+c=1
=>(a+b+c)^2016=1 >= a2016 + b2016 + c2016
Mà a2016 + b2016 + c2016 >=0
=> a2016 + b2016 + c2016=1
\(a+b=x+y\)
\(\Rightarrow a-x=y-b\) (1)
\(a^2+b^2=x^2+y^2\)
\(\Rightarrow a^2-x^2=y^2-b^2\)
\(\Leftrightarrow\left(a-x\right)\left(a+x\right)=\left(y-b\right)\left(y+b\right)\)
\(\Leftrightarrow\left(a-x\right)\left(a+x\right)-\left(a-x\right)\left(y+b\right)=0\)
\(\Leftrightarrow\left(a-x\right)\left[\left(a+x\right)-\left(y+b\right)\right]=0\)
\(\Leftrightarrow\left[{}\begin{matrix}a-x=0\\\left(a+x\right)-\left(y+b\right)=0\end{matrix}\right.\)
Với \(a-x=0\) , kết hợp với (1) ta được:
\(\left\{{}\begin{matrix}a-x=y-b\\a-x=0\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}b=y\\a=x\end{matrix}\right.\)
\(\Rightarrow a^{2016}+b^{2016}=x^{2016}+y^{2016}\)
Với \(a-x=y-b\)
\(\left\{{}\begin{matrix}a+b=x+y\\a+x=y+b\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}a=y\\b=x\end{matrix}\right.\)
\(\Rightarrow a^{2016}+b^{2016}=x^{2016}+y^{2016}\)