3 3 y x - -- 64
x^3 - y^3/64 при y = 4
x^3 - y^3/64
x^3 - (4)^3/64
x^3 - 4^3/64
-1 + x^3
x^3 - 0.015625*y^3
3 3 - y + 64*x ------------ 64
/ 2 2 \ (-y + 4*x)*\y + 16*x + 4*x*y/ ------------------------------- 64