Jawapan

2014-10-11T19:41:43+08:00
1/x-y × (x-y)(x+y) = (potong x-y dua2) = x+y
2014-10-11T20:00:26+08:00
=  1      ×    (x² - y²)
  x - y

=  1      ×    (x - y)(x - y)  - kembangkan
 x - y 

1       ×     1
x -y          x² - xy - yx + y²

= x³ - xy² - yx² - y³