Find the smallest integer $k\ge3$ with the property that it is possible to choose two of the number $1,2,...,k$ in such a way that their product is equal to the sum of the remaining $k-2$ numbers.
1. We start by defining the problem. We need to find the smallest integer \( k \geq 3 \) such that there exist two numbers \( a \) and \( b \) from the set \(\{1, 2, \ldots, k\}\) whose product equals the sum of the remaining \( k-2 \) numbers. Mathematically, this can be expressed as:
   \[
   ab = \sum_{i=1}^k i - a - b
   \]

2. The sum of the first \( k \) natural numbers is given by:
   \[
   \sum_{i=1}^k i = \frac{k(k+1)}{2}
   \]
   Therefore, the equation becomes:
   \[
   ab = \frac{k(k+1)}{2} - a - b
   \]

3. Rearrange the equation to isolate \( ab \):
   \[
   ab + a + b = \frac{k(k+1)}{2}
   \]
   Adding 1 to both sides, we get:
   \[
   (a+1)(b+1) = \frac{k(k+1)}{2} + 1
   \]

4. We need to find the smallest \( k \) such that \(\frac{k(k+1)}{2} + 1\) can be factorized into two factors \( a+1 \) and \( b+1 \) where \( 2 \leq a+1 \leq k+1 \) and \( 2 \leq b+1 \leq k+1 \).

5. Compute \(\frac{k(k+1)}{2} + 1\) for \( k \) from 3 to 10:
   \[
   \begin{array}{c|c}
   k & \frac{k(k+1)}{2} + 1 \\
   \hline
   3 & 7 \\
   4 & 11 \\
   5 & 16 \\
   6 & 22 \\
   7 & 29 \\
   8 & 37 \\
   9 & 46 \\
   10 & 56 \\
   \end{array}
   \]

6. Check if any of these values can be factorized into two factors within the range \( 2 \) to \( k+1 \):
   - For \( k = 10 \):
     \[
     \frac{10 \cdot 11}{2} + 1 = 56
     \]
     The factors of 56 are \( 1, 2, 4, 7, 8, 14, 28, 56 \). Among these, \( 7 \) and \( 8 \) are within the range \( 2 \) to \( 11 \).

7. Therefore, for \( k = 10 \), we can choose \( a = 6 \) and \( b = 7 \) (since \( a+1 = 7 \) and \( b+1 = 8 \)).

8. Verify the solution:
   \[
   ab = 6 \cdot 7 = 42
   \]
   \[
   \sum_{i=1}^{10} i - a - b = \frac{10 \cdot 11}{2} - 6 - 7 = 55 - 13 = 42
   \]
   The product of \( a \) and \( b \) equals the sum of the remaining numbers, confirming the solution.

The final answer is \( \boxed{10} \).