Question

分式的基本运算 (xy-x²)÷x²-2xy＋y²/xy·x-y／x² ﹙/代表÷)

很急，谢谢啦

Answer 1

(xy-x²)÷(x²-2xy＋y²)/xy·(x-y)／x²
=x(y-x) · xy/(x-y)² · (x-y)/x²
= -y

最后等于 -y

Answer 2

=y／x-1-2xy+y/x²-y/x²
=y/x-1-2xy
我可是严格按照顺序算的

Answer 3

请用( ) 把分子和分母分类