Fill in the blanks so that the equality holds
`1xx6789=________`

Answer

To solve the equation \(1xx6789 = \_\_\_\_\_\_\_\_\_\_\_\_\), we need to determine what \(xx\) represents in order for the equality to hold true.

### Step-by-Step Solution:

1. **Understanding the Equation**:
The equation is structured as \(1xx6789\). Here, \(xx\) represents two digits that we need to find. The number can be interpreted as \(1 \times 10000 + xx \times 100 + 6789\).

2. **Recognizing the Role of 1**:
Since the first digit is 1, we can simplify our understanding. The number \(1xx6789\) can be viewed as \(100000 + xx \times 100 + 6789\).

3. **Calculating the Value**:
We know that multiplying 1 with any number gives us that number itself. Therefore, we can focus on the number \(6789\) directly.

4. **Filling in the Blanks**:
Since \(1 \times 6789 = 6789\), we can conclude that \(xx\) must be \(00\) to keep the equality intact. Thus, we can fill in the blanks as \(10006789\).

5. **Final Answer**:
Therefore, the complete equation is \(10006789 = 10006789\).

### Final Answer:
**10006789**