2006 . | x - 1 | + ( x - 1 )2 = 2005 . | 1 - x |
\(\Rightarrow\)2006 . | x - 1 | + ( x - 1 )2 - 2005 . | 1 - x | = 0
Mà | x - 1 | = | 1 - x | = x - 1
Thay vào , ta được :
2006 . ( x - 1 ) + ( x - 1 )2 - 2005 . ( x - 1 ) = 0
( 2006 - 2005 ) . (x - 1 ) + ( x - 1 )2 = 0
( x - 1 ) + ( x - 1 )2 = 0
vì ( x - 1 )2 \(\ge\)0
\(\Rightarrow\hept{\begin{cases}x-1=0\\\left(x-1\right)^2=0\end{cases}}\)
\(\Rightarrow\hept{\begin{cases}x=1\\x=1\end{cases}\left(tm\right)}\)
Vậy x = 1