Question

Thực hiện phép tính 

a) \([15\left(x-y\right)^5-10\left(x-y\right)^4+20\left(x-y\right)^3]\div5\left(x-y\right)^3\)

Answer 1

\(=\frac{15\left(x-y\right)^5}{5\left(x-y\right)^3}-\frac{10\left(x-y\right)^4}{5\left(x-y\right)^3}+\frac{20\left(x-y\right)^3}{5\left(x-y\right)^3}\)

\(=3\left(x-y\right)^5-2\left(x-y\right)^4+4\left(x-y\right)^3\)

Answer 2

sửa dòng cuối

\(=3\left(x-y\right)^2-2\left(x-y\right)+4\)