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^2 znaczy do potegi drugiej
^3 znaczy do potegi trzeciej
x^2+xy x y
--------- * ( --- - ----- )
x^2+y^2 x-y x+y
te ---- to kreska ulamkowa a () to nawias i w tym nawiasie sa cale te dwa ulamki.
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x^3 y
-------
x^2+y^2 * ( x+y)
=
x^3y
---------
^ 4
=
x^3y
------
2
x^2+xy x y x(x + y) x(x + y) - y(x - y)
--------- * ( --- - ----- ) = ------------ * ---------------------------- =
x^2+y^2 x - y x+y x^2+y^2 (x - y)(x + y)
x x^2 + xy - xy + y^2 x x^2+y^2 x
= ----------- * ------------------------ = ----------- * -------------- = ------------
x^2+y^2 x - y x^2+y^2 x - y x - y