E ŞIKKI
x - 2/x=4 her iki tarafin karesini alalim,
(x- 2/x) (x -2/x)= 16
x^2- 4x/x+4/x^2= 16
x^2+4/x^2= 20
x^3- 8/x^3= x^3- (2/x)^3= (x-2/x)(x^2+2x/x+4/x^2)
= 4.(20+2)= 88 olur.
