Question

rozwiąż

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

Answer 1

założenia :

 

 

 

Answer 2

zał.x≠ ±1

     x∈R\{-1,1}

 

x/(x-1)(x+1) - (x+1)(x+1)/(x-1)(x+1)=

=[ x -(x+1)²]/(x-1)(x+1) =[x-(x²+2x+1)]/(x+1)(x-1)=

=(x-x²-2x-1)/(x+1)(x-1)=(-x²-x-1)/(x-1)(x+1)=

=-(x²+x+1)/(x²-1)