Find value of $$\frac{1}{1+x+xy}+\frac{1}{1+y+yz}+\frac{1}{1+z+zx}$$ if $x$, $y$ and $z$ are real numbers usch that $xyz=1$
Given the expression:
\[ \frac{1}{1+x+xy}+\frac{1}{1+y+yz}+\frac{1}{1+z+zx} \]
and the condition \( xyz = 1 \), we need to find the value of the expression.

1. **Common Denominator Approach**:
   - We start by finding a common denominator for the fractions. Let's consider the common denominator to be \( 1 + z + zx \).
   - To achieve this, we multiply the first fraction by \( \frac{z}{z} \) and the second fraction by \( \frac{xz}{xz} \).

2. **Rewriting the Fractions**:
   - The first fraction becomes:
     \[
     \frac{1}{1+x+xy} \cdot \frac{z}{z} = \frac{z}{z(1+x+xy)} = \frac{z}{1+z+zx}
     \]
   - The second fraction becomes:
     \[
     \frac{1}{1+y+yz} \cdot \frac{xz}{xz} = \frac{xz}{xz(1+y+yz)} = \frac{xz}{1+z+zx}
     \]
   - The third fraction remains:
     \[
     \frac{1}{1+z+zx}
     \]

3. **Combining the Fractions**:
   - Now, we can combine the fractions since they have a common denominator:
     \[
     \frac{z}{1+z+zx} + \frac{xz}{1+z+zx} + \frac{1}{1+z+zx}
     \]
   - Combine the numerators:
     \[
     \frac{z + xz + 1}{1+z+zx}
     \]

4. **Simplifying the Numerator**:
   - Notice that the numerator \( z + xz + 1 \) can be factored as:
     \[
     z + xz + 1 = z(1 + x) + 1
     \]
   - Given the condition \( xyz = 1 \), we know \( z = \frac{1}{xy} \). Substituting \( z \) in the numerator:
     \[
     \frac{1}{xy}(1 + x) + 1 = \frac{1 + x}{xy} + 1
     \]
   - However, this substitution is not necessary for the final simplification.

5. **Final Simplification**:
   - The numerator \( z + xz + 1 \) is exactly the same as the denominator \( 1 + z + zx \):
     \[
     \frac{z + xz + 1}{1+z+zx} = \frac{1+z+zx}{1+z+zx} = 1
     \]

Thus, the value of the given expression is:
\[
\boxed{1}
\]