Cách 1:
Cách 2:
\(\left(x^4-2x^3+2x-1\right):\left(x^2-1\right)\)
\(=\left[\left(x^4-1\right)-\left(2x^3-2x\right)\right]:\left(x^2-1\right)\)
\(=\left[\left(x^2-1\right)\left(x^2+1\right)-2x\left(x^2-1\right)\right]:\left(x^2-1\right)\)
\(=\left(x^2-1\right)\left(x^2-2x+1\right):\left(x^2-1\right)\)
\(=x^2-2x+1\)
