Question

已知x分之一减y分之一等于2001,求分式x减y分支x减xy减y的值

Answer 1

1/x -1/y=2001 (y-x)/xy=2001 y-x=2001xy x-y=-2001xy

(x-xy-y)/(x-y)=(-2001xy-xy)/(-2001xy)=2002/2001