Tim x thuoc N biet
( x - 2 )^2016 + \(\left|x-3\right|\) =1
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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
\(\frac{1}{3}+\frac{1}{6}+\frac{1}{10}+...+\frac{1}{x.\left(x+1\right):2}=\frac{2009}{2011}\)
\(\frac{1}{6}+\frac{1}{12}+\frac{1}{20}+...+\frac{1}{x.\left(x+1\right)}=\frac{2009}{4022}\)(nhân mỗi vế với 1/2)
\(\frac{1}{2.3}+\frac{1}{3.4}+\frac{1}{4.5}+...+\frac{1}{x.\left(x+1\right)}=\frac{2009}{4022}\)
\(\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+...+\frac{1}{x}-\frac{1}{x+1}=\frac{2009}{4022}\)
\(\frac{1}{2}-\frac{1}{x+1}=\frac{2009}{4022}\)\(\Rightarrow\frac{1}{x+1}=\frac{1}{2}-\frac{2009}{4022}=\frac{1}{2011}\)
\(\Rightarrow x+1=2011\Rightarrow x=2010\)
\(\frac{1}{3}+\frac{1}{6}+\frac{1}{10}+...+\frac{1}{x\left(x+1\right):2}=\frac{2009}{2011}\)
\(\Rightarrow\frac{1}{2}\left(\frac{1}{3}+\frac{1}{6}+\frac{1}{10}+...+\frac{1}{x\left(x+1\right):2}\right)=\frac{2009}{4022}\)
\(\Rightarrow\frac{1}{6}+\frac{1}{12}+\frac{1}{20}+...+\frac{1}{x\left(x+1\right)}=\frac{2009}{4022}\)
\(\Rightarrow\frac{1}{2.3}+\frac{1}{3.4}+\frac{1}{4.5}+...+\frac{1}{x\left(x+1\right)}\)\(=\frac{2009}{4022}\)
\(\Rightarrow\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{x}-\frac{1}{x+1}\)\(=\frac{2009}{4022}\)
\(\Rightarrow\frac{1}{2}-\frac{1}{x+1}=\frac{2009}{4022}\)
\(\Rightarrow\frac{1}{x+1}=\frac{1}{2}-\frac{2009}{4022}\)
\(\Rightarrow\frac{1}{x+1}=\frac{1}{2011}\)
\(\Rightarrow x+1=2011\)
\(\Rightarrow x=2010\)
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