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\(H=2^{2010}-2^{2009}-...-2^2-2-1\)
\(2H=2^{2011}-2^{2010}-...-2^3-2^2-2\)
\(2H-H=\left(2^{2011}-2^{2010}-...-2^3-2^2-2\right)-\left(2^{2010}-2^{2009}-...-2^2-2-1\right)\)
\(H=2^{2011}-2^{2010}-2^{2010}-1\)
\(H=2^{2011}-\left(2^{2010}+2^{2010}\right)-1\)
\(H=2^{2011}-2.2^{2010}-1\)
\(H=2^{2011}-2^{2011}-1\)
\(H=-1\)
Suy ra \(2017^H=2017^{-1}=\frac{1}{2017}\)
Vậy \(2017^H=\frac{1}{2017}\)
Chúc bạn học tốt
\(\dfrac{2017}{1}+\dfrac{2016}{2}+...+\dfrac{2}{2016}+\dfrac{1}{2017}\)
\(=\left(\dfrac{2016}{2}+1\right)+\left(\dfrac{2015}{3}+1\right)+...+\left(\dfrac{2}{2016}+1\right)+\left(\dfrac{1}{2017}+1\right)+1\)
\(=\dfrac{2018}{2}+\dfrac{2018}{3}+...+\dfrac{2018}{2017}+\dfrac{2018}{2018}\)
\(=2018\left(\dfrac{1}{2}+\dfrac{1}{3}+\dfrac{1}{4}+...+\dfrac{1}{2018}\right)\)
Theo đề, ta có: \(x=\dfrac{2018\left(\dfrac{1}{2}+\dfrac{1}{3}+\dfrac{1}{4}+...+\dfrac{1}{2018}\right)}{\dfrac{1}{2}+\dfrac{1}{3}+\dfrac{1}{4}+...+\dfrac{1}{2018}}=2018\)
2/ \(\left(x-1\right)^{2004}+\left(x^2-1\right)^{2016}+|x^2-x|\)
\(\left(x-1\right)^{2004}\ge0\forall x;\left(x^2-1\right)^{2016}\ge0\forall x;|x^2-x|\ge0\forall x\)
\(\Rightarrow\left(x-1\right)^{2004}+\left(x^2-1\right)^{2016}+|x^2-x|\ge0\)
\(\Rightarrow\hept{\begin{cases}\left(x-1\right)^{2004}=0\Rightarrow x-1=0\Rightarrow x=1\\\left(x^2-1\right)^{2016}=0\Rightarrow x-1=0\Rightarrow x=1\\|x^2-x|=0\Rightarrow x-x=0\Rightarrow x=1\end{cases}}\)
bímậtnhé Sai rồi :
Ta có :
\(\left(x-1\right)^{2004}+\left(x^2-1\right)^{2016}+\left|x^2-x\right|=0\)
\(\hept{\begin{cases}\left(x-1\right)^{2004}=0\\\left(x^2-1\right)^{2006}=0\\\left|x^2-x\right|=0\end{cases}\Leftrightarrow\hept{\begin{cases}x-1=0\\x^2-1=0\\x^2-x=0\end{cases}}}\)
+) Từ \(x-1=0\)\(\Rightarrow\)\(x=1\)
+) Từ \(x^2-1=0\)\(\Rightarrow\)\(x^2=1\)\(\Rightarrow\)\(\orbr{\begin{cases}x=1\\x=-1\end{cases}}\)
+) Từ \(x^2-x=0\)\(\Rightarrow\)\(x\left(x-1\right)=0\)\(\Rightarrow\)\(\orbr{\begin{cases}x=0\\x-1=0\end{cases}\Leftrightarrow\orbr{\begin{cases}x=0\\x=1\end{cases}}}\)
Vậy \(x\in\left\{-1;0;1\right\}\)
Chúc bạn học tốt ~
Ta có :
H = 22017 - 22016 - ... - 2 - 1
H = 22016 - ... - 2 - 1
...
H = 1
\(\Rightarrow\)2017H = 20171 = 2017
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