\(M=x^3+x^2y-2x^2-xy-y^2+3y+x+2006\)
\(=\left(x^3+x^2y-2x^2\right)+\left(-xy-y^2+2y\right)+\left(y+x-2\right)+2008\)
\(=x^2\left(x+y-2\right)-y\left(x+y-2\right)+\left(x+y-2\right)+2008\)
\(=\left(x+y-2\right)\left(x^2-y+1\right)+2008\)
\(=0.\left(x^2-y+1\right)+2008\)
\(=2008\)
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\(x+y-2=0\Rightarrow x+y=2\)
\(M=x^3+x^2y-2x^2-xy-y^2+3y+x+2006\)
\(=x^2\left(x+y\right)-2x^2-y\left(x+y\right)+3y+x+2006\)
\(=2x^2-2x^2-2y+3y+x+2006\)
\(=y+x+2006\)
\(=2+2006\)
\(=2008\)
M=x^3 + x^2y - 2x^2 - xy - y^2 + 3xy + x+ 2006
=x^2(x+y-2) -y(x+y-2) + (y+x-2) + 2006
=0+0+0+2006
=2006