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\(\left(x-2011\right)^{x+1}-\left(x-2011\right)^{x+2011}=0\)
\(\left(x-2011\right)^{x+1}\left[1-\left(x-2011\right)^{2010}\right]=0\)
\(\Rightarrow\orbr{\begin{cases}\left(x-2011\right)^{x+1}=0\\1-\left(x-2011\right)^{2010}=0\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x-2011=0\\\left(x-2011\right)^{2010}=1\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=2011\\x-2011=-1;1\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=2011\\x=2010;2012\end{cases}}\)
Vậy \(x=2010;2011;2012\)
(x - 2011)x +1 - (x - 2011)x + 2011 = 0
ta có : x - 2011 = 0 => x= 2011
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b) (4x -1)2 = (1-4x)4 (1)
Vì (1 - 4x) = (4x - 1)
\(\Rightarrow\)(1 - 4x)4 = [ -( 4x -1)4 ]
Vì (1-4x)4 = ( 4x - 1)4
Do đó (1) có dạng :
(4x - 1)2 = (4x - 1)2
Đặt 4x - 1 = x, ta có :
x2 = x4
x2 ( 1 - x2 ) = 0
\(\Rightarrow\)\(\orbr{\begin{cases}x=0\\x^2=\orbr{\begin{cases}1^2\\\left(-1\right)^2\end{cases}}\end{cases}}\)\(\Leftrightarrow\)\(\orbr{\begin{cases}x=0\\x=\orbr{\begin{cases}x=1\\x=-1\end{cases}}\end{cases}}\)
Thay x = 4x -1 = 0
x = \(\frac{1}{4}\)
- x = 1 \(\Leftrightarrow\) 4x - 1 = 1
x = \(\frac{1}{2}\)
- x = -1 \(\Leftrightarrow\) 4x -1 = -1
x = 0
Vậy x = \(\frac{1}{2}\) hoặc x = 0
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Xét \(x\le2010\Rightarrow2010-x+2011-x=2012\Rightarrow x=\frac{2009}{2}\left(TM\right)\)
Xét \(2010< x< 2011\Rightarrow x-2010+2011-x\Rightarrow1=2012\left(loại\right)\)
Xét \(x\ge2011\Rightarrow x-2010+x-2011=2012\Rightarrow x==\frac{6033}{2}\left(TM\right)\)
Vậy \(x\in\left\{\frac{2009}{2};\frac{6033}{2}\right\}\)
Ta cÓ : ( x - 2011) x+ 1 - ( x - 2011)x + 2011
=) x - 2011= 0 =) x = 2011
x - 2011 = 0 =) x = 2011