Resposta :
Vamos là.
f(a + b) = f(a) * f(b)
f(9) = f(4 + 5) = f(4) * f(5) = 3 * 4 = 12
f(0 + 4) = f(0) * f(4)
f(4) = f(0) * f(4)
f(0) = f(4)/f(4) = 1
f(0) + f(9) = 1 + 12 = 13
Vamos là.
f(a + b) = f(a) * f(b)
f(9) = f(4 + 5) = f(4) * f(5) = 3 * 4 = 12
f(0 + 4) = f(0) * f(4)
f(4) = f(0) * f(4)
f(0) = f(4)/f(4) = 1
f(0) + f(9) = 1 + 12 = 13