Question

计算（x-y)³÷（y-x)²

Answer 1

原式=(x-y)³÷[-(x-y)]²
=(x-y)³÷(x-y)²
=x-y

Answer 2

（x-y)³÷（y-x)²
=（x-y)³÷（x-y)²
=x-y

Answer 3

写成分数形式更直观吧。