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Ta có: \(\hept{\begin{cases}\left(2x+1\right)^{2008}\ge0\forall x\\|3y-1|^{2007}\ge0\forall y\end{cases}}\)\(\Rightarrow\left(2x+1\right)^{2008}+|3y-1|^{2007}\ge0\forall x,y\)
Do đó \(\left(2x+1\right)^{2008}+|3y-1|^{2007}=0\)
\(\Leftrightarrow\hept{\begin{cases}2x+1=0\\3y-1=0\end{cases}\Leftrightarrow\hept{\begin{cases}x=\frac{-1}{2}\\y=\frac{1}{3}\end{cases}}}\)
Vậy \(\hept{\begin{cases}x=\frac{-1}{2}\\y=\frac{1}{3}\end{cases}}\)
(x+2007) + ( x+1+2006) + ..... +0 =0
=> x +2007 =0
=> x =-2007
\(\dfrac{x-1}{2009}+\dfrac{x-2}{2008}=\dfrac{x-3}{2007}+\dfrac{x-4}{2006}\)
\(\dfrac{x-1}{2009}-1+\dfrac{x-2}{2008}-1=\dfrac{x-3}{2007}-1+\dfrac{x-4}{2006}\)
\(\dfrac{x-2010}{2009}+\dfrac{x-2010}{2008}-\dfrac{x-2010}{2007}-\dfrac{x-2010}{2006}=0\)
\(\left(x-2010\right)\times\left(\dfrac{1}{2009}+\dfrac{1}{2008}-\dfrac{1}{2007}-\dfrac{1}{2006}\right)=0\)
Vì \(\dfrac{1}{2009}+\dfrac{1}{2008}-\dfrac{1}{2007}-\dfrac{1}{2006}\ne0\)
=> \(x-2010=0\)
\(x=2010\)
\(\dfrac{x-1}{2009}\)+\(\dfrac{x-2}{2008}\)=\(\dfrac{x-3}{2007}\)+\(\dfrac{x-4}{2006}\)
=>\(\dfrac{x-1}{2009}\)-1+\(\dfrac{x-2}{2008}\)+1=\(\dfrac{x-3}{2007}\)-1+\(\dfrac{x-4}{2006}\)-1
=>(x-2010)x(\(\dfrac{1}{2009}\)+\(\dfrac{1}{2008}\)-\(\dfrac{1}{2007}\)-\(\dfrac{1}{2006}\))=0
=>x-2010=0 (vì \(\dfrac{1}{2009}\)+\(\dfrac{1}{2008}\)-\(\dfrac{1}{2007}\)\(\dfrac{1}{2006}\)≠0)
=>x=2010
Vì \(\left|2x-27\right|^{2007}\ge0\) với mọi x; \(\left(3y+10\right)^{2008}\ge0\) với mọi x.
Do đó: \(\left|2x-27\right|^{2007}+\left(3y+10\right)^{2008}\ge0\) với mọi x.
Theo đề bài, ta có:
\(\left|2x-27\right|^{2007}=0\Rightarrow2x-27=0\Rightarrow x=....\)
\(\left(3y+10\right)^{2008}=0\Rightarrow3y+10=0\Rightarrow y=.....\)
\(\frac{2009x2008-1}{2007x2009+2008}=\frac{2009x2007+2009-1}{2009x2007+2008}=1.\)
vậy biểu thức trên =1
1)
X10=1X
=>x10=1
=>x10=110 ; x10=(-1)10
=>x=1;x=-1
2)
(2x-2007)2008-(2x-2007)2009=0
=>(2x-2007)2008.(1+2x-2007)=0
=>hoặc (2x-2007)2008=0 =>2x-2007=0 =>2x=2007 =>x=2007/2
hoặc 1+2x-2007=0 =>1+2x=2007 =>2x=2006 =>x=1003
Vậy x=2007/2 ; x=1003
3)
=>(x-1)2=1242
=>(x-1)2=? (Chịu)