Let $ a,b,c$ be positive numbers.Find $ k$ such that:
$ (k \plus{} \frac {a}{b \plus{} c})(k \plus{} \frac {b}{c \plus{} a})(k \plus{} \frac {c}{a \plus{} b}) \ge (k \plus{} \frac {1}{2})^3$
To solve the problem, we need to find the value of \( k \) such that the inequality 

\[
\left(k + \frac{a}{b+c}\right)\left(k + \frac{b}{c+a}\right)\left(k + \frac{c}{a+b}\right) \ge \left(k + \frac{1}{2}\right)^3
\]

holds for all positive numbers \( a, b, c \).

1. **Generalization and Jensen's Inequality**:
   The problem can be generalized to \( n \) variables. Let \( a_1, a_2, \ldots, a_n \) be nonnegative real numbers with \( n \geq 3 \). We need to show that:

   \[
   \prod_{i=1}^n \left(k + \frac{a_i}{\sum_{j \neq i} a_j}\right) \ge \left(k + \frac{1}{n-1}\right)^n
   \]

   We use the function \( f(x) = \ln \left(k + \frac{x}{1-x}\right) \). By Jensen's Inequality, if \( f \) is convex, then:

   \[
   f(a_1) + f(a_2) + \cdots + f(a_n) \ge n f\left(\frac{a_1 + a_2 + \cdots + a_n}{n}\right)
   \]

   Given \( a_1 + a_2 + \cdots + a_n = 1 \), we need to check the convexity of \( f \).

2. **Convexity Analysis**:
   For \( k \ge \frac{1}{2} \), the function \( f(x) = \ln \left(k + \frac{x}{1-x}\right) \) is convex. This follows from the second derivative test for convexity.

3. **Half Convex Function Theorem (HCF-Theorem)**:
   If \( 0 < k < \frac{1}{2} \), we need to use the HCF-Theorem. The function \( f \) is convex for \( x \ge s = \frac{1}{n} \). According to the HCF-Theorem, it suffices to prove the inequality for \( a_2 = a_3 = \cdots = a_n \).

4. **Simplification for \( n = 3 \)**:
   For \( n = 3 \), we need to prove the inequality for \( a_2 = a_3 = 1 \). This reduces the problem to:

   \[
   \left(k + \frac{a}{2}\right)\left(k + \frac{1}{1+a}\right)\left(k + \frac{1}{1+a}\right) \ge \left(k + \frac{1}{2}\right)^3
   \]

   Simplifying this expression and verifying the inequality for \( k \ge \frac{1}{2} \) will complete the proof.

5. **Verification**:
   By substituting \( a = 1 \) and checking the inequality, we find that the inequality holds for \( k \ge \frac{1}{2} \).

\(\blacksquare\)

The final answer is \( \boxed{ k \ge \frac{1}{2} } \)