Question

выполните  действия 4x/x^2-y^2-4/x+y

Answer 1

[ 4X / ( X - Y)*( X + Y ) ] - [ 4 / ( X + Y ) ] = 
= ( 4X - 4 * ( X - Y ) / ( X^2 - Y^2 ) =
=  4Y / ( X^2 - Y^2 )