A) x^2 1 1 x^3 + 1 x
(---------- + ------ ) x ---------------------- = -------------- x ------------ = x + 1
1 x x 1 1 x x^2 + 1 - x
---- + ---- - ------
1 x 1
в) x^3 y^3 x^3 - y^3 1 1 x^3 - y^3 x^3 + y^3
----------------- х ---------------- x ( ------- + --------- ) = --------------- x --------------
x^3 + y^3 x^3 y^3 x^3 y^3 x^3 + y^3 x^3 y^3
x^3 - y^3
= ----------------
x^3 y^3