Question

1/y+1/x-y решите пожалуйста!!!

Answer 1

$\frac{1}{y}+\frac{1}{x-y}=\frac{1*(x-y)}{y(x-y)}+\frac{1*y}{y(x-y)}=\frac{1*(x-y)+1*(x-y)}{xy-y^2}=\frac{y+x-y}{xy-y^2}=\frac{x}{xy-y^2}$