Ta có: \(\frac{x^5+x^3+x^2+1}{x^3+x^2+x+1}\)
\(=\frac{x^3\left(x^2+1\right)+\left(x^2+1\right)}{x^2\left(x+1\right)+\left(x+1\right)}\)
\(=\frac{\left(x^2+1\right)\left(x^3+1\right)}{\left(x+1\right)\left(x^2+1\right)}\)
\(=\frac{\left(x+1\right)\left(x^2-x+1\right)}{x+1}\)
\(=x^2-x+1\)