tìm y biết : a, y mũ 200 = y. b, y mũ 2008 = y mũ 2010. c, ( 2y-1 ) mũ 50 = 2y-1 . d, ( y/3 – 5 ) mũ 2000 = ( y/5 -5 ) mũ 2008

`a) y^200=y`

`=> y^200 -y=0 `

`=>y(y^199-1)=0`

`=>` \(\left[ \begin{array}{l}y=0\\y^{199} -1=0\end{array} \right.\) 

`=>`\(\left[ \begin{array}{l}y=0\\y=1\end{array} \right.\)

`b) y^2008=y^2010`

`=> y^2008-y^2000=0`

`=> y^2008(1-y^2)=0`

`=>` \(\left[ \begin{array}{l}y^{2008}=0\\1-y^{2}=0\end{array} \right.\) 

`=>` \(\left[ \begin{array}{l}y=0\\y=1\\y=-1\end{array} \right.\) 

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