\(\frac{4\left(x-y\right)^5+2\left(x-y\right)^3-\left(x-y\right)^2}{\left(y-x\right)^2}\)
\(=\frac{4\left(x-y\right)^5+2\left(x-y\right)^3-\left(x-y\right)^2}{\left(x-y\right)^2}\)
\(=4\left(x-y\right)^3+2\left(x-y\right)-1\)
Điều kiện
\(x\ne y\)
A=\(-4\left(x-y\right)^3-2\left(x-y\right)+1\)