Bài 1:
\(1.x^2+7x+6\\
=\left(x^2+x\right)+\left(6x+6\right)\\
=x\left(x+1\right)+6\left(x+1\right)\\
=\left(x+1\right)\left(x+6\right)\\
2.x^4+2008x^2+2007x+2008\\
=\left(x^4-x\right)+\left(2008x^2+2008x+2008\right)\\
=x\left(x^3-1\right)+2008\left(x^2+x+1\right)\\
=x\left(x-1\right)\left(x^2+x+1\right)+2008\left(x^2+x+1\right)\\
=\left(x^2+x+1\right)\left(x^2-x+2008\right)\)