Find all functions $f : R \to R$ which satisfy  $f  \left(\frac{\sqrt3}{3} x\right) = \sqrt3 f(x) - \frac{2\sqrt3}{3} x$ 

and $f(x)f(y) = f(xy) + f  \left(\frac{x}{y} \right) $   for all $x, y \in R$, with $y \ne 0$
1. **Given Functional Equations:**
   \[
   f\left(\frac{\sqrt{3}}{3} x\right) = \sqrt{3} f(x) - \frac{2\sqrt{3}}{3} x
   \]
   and
   \[
   f(x)f(y) = f(xy) + f\left(\frac{x}{y}\right) \quad \text{for all } x, y \in \mathbb{R}, y \neq 0.
   \]

2. **Initial Observation:**
   We are given that \( f(x) = x + \frac{1}{x} \) is a solution. We need to verify this and show that it is the only solution.

3. **Verification of the First Functional Equation:**
   Substitute \( f(x) = x + \frac{1}{x} \) into the first functional equation:
   \[
   f\left(\frac{\sqrt{3}}{3} x\right) = \frac{\sqrt{3}}{3} x + \frac{3}{\sqrt{3} x} = \frac{\sqrt{3}}{3} x + \frac{\sqrt{3}}{x}
   \]
   \[
   \sqrt{3} f(x) - \frac{2\sqrt{3}}{3} x = \sqrt{3} \left( x + \frac{1}{x} \right) - \frac{2\sqrt{3}}{3} x = \sqrt{3} x + \frac{\sqrt{3}}{x} - \frac{2\sqrt{3}}{3} x
   \]
   Simplifying the right-hand side:
   \[
   \sqrt{3} x + \frac{\sqrt{3}}{x} - \frac{2\sqrt{3}}{3} x = \frac{\sqrt{3}}{3} x + \frac{\sqrt{3}}{x}
   \]
   Both sides are equal, so \( f(x) = x + \frac{1}{x} \) satisfies the first functional equation.

4. **Verification of the Second Functional Equation:**
   Substitute \( f(x) = x + \frac{1}{x} \) into the second functional equation:
   \[
   f(x)f(y) = \left( x + \frac{1}{x} \right) \left( y + \frac{1}{y} \right) = xy + x \cdot \frac{1}{y} + \frac{1}{x} \cdot y + \frac{1}{xy}
   \]
   \[
   f(xy) + f\left(\frac{x}{y}\right) = \left( xy + \frac{1}{xy} \right) + \left( \frac{x}{y} + \frac{y}{x} \right)
   \]
   Simplifying both sides:
   \[
   xy + \frac{x}{y} + \frac{y}{x} + \frac{1}{xy} = xy + \frac{1}{xy} + \frac{x}{y} + \frac{y}{x}
   \]
   Both sides are equal, so \( f(x) = x + \frac{1}{x} \) satisfies the second functional equation.

5. **Uniqueness:**
   To show that \( f(x) = x + \frac{1}{x} \) is the only solution, consider the given functional equations. Let \( P(x) \) be the assertion of the first functional equation:
   \[
   P\left(\frac{1}{x}\right) \implies f\left(\frac{\sqrt{3}}{3x}\right) = \sqrt{3} f\left(\frac{1}{x}\right) - \frac{2\sqrt{3}}{3x}
   \]
   Since \( f\left(\frac{1}{x}\right) = f(x) \) for all \( x \neq 0 \), we have:
   \[
   f\left(\frac{\sqrt{3}}{3x}\right) = \sqrt{3} f(x) - \frac{2\sqrt{3}}{3x}
   \]
   This implies that \( f(x) \) must be of the form \( C\left(x + \frac{1}{x}\right) \) for some constant \( C \). Plugging this form into the functional equations, we find that \( C = 1 \).

Thus, the only solution is \( f(x) = x + \frac{1}{x} \).

The final answer is \( \boxed{ f(x) = x + \frac{1}{x} } \).