------
## 最终结论
```python
def optimalDivision(nums):
    if len(nums) == 1:
        return str(nums[0])
    elif len(nums) == 2:
        return f"{nums[0]}/{nums[1]}"
    else:
        # For more than two numbers, we put parentheses around the last part
        return f"{nums[0]}/({'/'.join(map(str, nums[1:]))})"

# Example usage:
print(optimalDivision([1000, 100, 10, 2]))  # Output: "1000/(100/10/2)"
```