[กขฃคฅฆง]

1. $x = \dfrac{4}{3} $

2. 2

3. min = $\dfrac{\sqrt{3} }{2} $ max = $\sqrt{3} $

7. $f^n(x) = a^nx + \dfrac{b(1-a^n)}{1-a} $

$\dfrac{ f^n(x) - f^{n-1}(x)}{a^n} = \dfrac{ax-x+b}{a} $

$(x_n,y_n) = (\dfrac{b-ab}{a^2-a+1} , \dfrac{b}{a^2-a+1} )$

$\lim_{n \to \infty} f^n(x) = \dfrac{b}{1-a}$