Question

СРОЧНО! ПОМОГИТЕ!!! 
  y+1       1-x     -- ?
y^2-xy    x^2-xy

Answer 1

 y+1       1-x     --
y^2-xy    x^2-xy
(y+1)/y(y-x)-(1-x)/x(x-y)=(x(y+1)+y(1-x))/xy(y-x)=(xy+x+y-xy)/xy(y-x)=(x+y)/xy(y-x)