Question

Se f(x)= $\frac{2x+1}{x-2}$ , então quanto é f(f(x)) ?

Answer 1

[2.(2x+1/x-2) +1] / [(2x+1/x-2) -2]

(4x +2 + x-2 / x-2 ) / (2x+1 -2x +4 / x -2)

(5x / x-2) / (5/ x-2)

(5x / x-2) .( x-2 / 5)

5x/5

x