Làm tính chia: (x – y)^5 : (y – x)^4

* Hướng dẫn giải

Ta có: y – x= -1.(x – y) nên ${\left(y-x\right)}^4=\left[-1.{\left(x-y\right)}^4\right]={\left(-1\right)}^4.{\left(x-y\right)}^4={\left(x-y\right)}^4$

${\left(x-y\right)}^5:{\left(y-x\right)}^4$ = ${\left(x-y\right)}^5:{\left(x-y\right)}^4$ = x – y