Ta có : \(\left(x-2\right)^{2016}\)dương

\(\Rightarrow x-3=0\Rightarrow x=3\)

Thay x ta thử :

 \(\left(3-2\right)^{2016}+\left(3-3\right)=1+0=1\)thỏa đề

Vậy \(x=3\)

Đặt \(A=\left(x-2\right)^{2016}+\left(x-3\right)\)

\(x-2< 2\) vì nếu \(x-2\ge2\)

\(\Rightarrow x-3\ge1\)

\(\left(x-2\right)^{2016}>3\)

\(\Rightarrow A=\left(x-2\right)^{2016}+\left(x-3\right)>3\) ( vô lý )

\(\Rightarrow x-2< 2\)

\(\Rightarrow x< 4\)

Với \(x=0\)

\(\Rightarrow A=\left(x-2\right)^{2016}+\left(x-3\right)=2^{2016}-3>3\)

Với \(x=1\)

\(\Rightarrow A=\left(x-2\right)^{2016}+\left(x-3\right)< 0< 3\)

Với \(x=2\)

\(\Rightarrow A=\left(x-2\right)^{2016}+\left(x-3\right)=0-1< 3\)

Với \(x=3\)

\(\Rightarrow A=\left(x-2\right)^{2016}+\left(x-3\right)=1+0< 3\)

Do đó không có \(x\in N\) thỏa mãn.

\(x^{2016}=x^5\)

=>\(x^{2016}-x^5=0\)

=>\(x^5\left(x^{2011}-1\right)=0\)

=>x⁵=0 hoặc x²⁰¹¹-1=0

=>x=0 hoặc x=1

x=0 x=1

x=0 hoặc x=1

Vì: 1²⁰¹⁶=1

1⁵⁼¹

0²⁰¹⁶=0

0⁵=0

\(\frac{1}{3}+\frac{1}{6}+\frac{1}{10}+...+\frac{1}{x.\left(x+1\right):2}=\frac{2009}{2011}\)

\(\frac{1}{6}+\frac{1}{12}+\frac{1}{20}+...+\frac{1}{x.\left(x+1\right)}=\frac{2009}{4022}\)(nhân mỗi vế với 1/2)

\(\frac{1}{2.3}+\frac{1}{3.4}+\frac{1}{4.5}+...+\frac{1}{x.\left(x+1\right)}=\frac{2009}{4022}\)

\(\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+...+\frac{1}{x}-\frac{1}{x+1}=\frac{2009}{4022}\)

\(\frac{1}{2}-\frac{1}{x+1}=\frac{2009}{4022}\)\(\Rightarrow\frac{1}{x+1}=\frac{1}{2}-\frac{2009}{4022}=\frac{1}{2011}\)

\(\Rightarrow x+1=2011\Rightarrow x=2010\)

\(\frac{1}{3}+\frac{1}{6}+\frac{1}{10}+...+\frac{1}{x\left(x+1\right):2}=\frac{2009}{2011}\)

\(\Rightarrow\frac{1}{2}\left(\frac{1}{3}+\frac{1}{6}+\frac{1}{10}+...+\frac{1}{x\left(x+1\right):2}\right)=\frac{2009}{4022}\)

\(\Rightarrow\frac{1}{6}+\frac{1}{12}+\frac{1}{20}+...+\frac{1}{x\left(x+1\right)}=\frac{2009}{4022}\)

\(\Rightarrow\frac{1}{2.3}+\frac{1}{3.4}+\frac{1}{4.5}+...+\frac{1}{x\left(x+1\right)}\)\(=\frac{2009}{4022}\)

\(\Rightarrow\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{x}-\frac{1}{x+1}\)\(=\frac{2009}{4022}\)

\(\Rightarrow\frac{1}{2}-\frac{1}{x+1}=\frac{2009}{4022}\)

\(\Rightarrow\frac{1}{x+1}=\frac{1}{2}-\frac{2009}{4022}\)

\(\Rightarrow\frac{1}{x+1}=\frac{1}{2011}\)

\(\Rightarrow x+1=2011\)

\(\Rightarrow x=2010\)

 = 2010