Odpowiedzi

2013-07-23T09:51:22+02:00

    x               2xy                x                  2x

(-------   -   -----------   +   ---------)  :  (---------)   =

  x - y          x² - y²            x + y           x + y

 

x(x + y) - 2xy + x(x - y)           2x(x - y)

------------------------------   :   -----------------   =  

    (x + y)(x - y)                     (x + y)(x - y)

 

x² + xy - 2xy + x² - xy            2x² - 2xy

----------------------------   :   ------------------   =

    (x + y)(x - y)                   (x + y)(x - y)

 

   2x² - 2xy              (x + y)(x - y)

-----------------   *   --------------------   =   1

(x + y)(x - y)             2x² - 2xy

 

c.n.d.