`123xx123+77xx77+2xx123xx77=`?

Explanation

To solve the expression \( 123 \times 123 + 77 \times 77 + 2 \times 123 \times 77 \), we can follow these steps:

### Step-by-Step Solution:

1. **Identify the terms**: The expression consists of three parts: \( 123 \times 123 \), \( 77 \times 77 \), and \( 2 \times 123 \times 77 \).

2. **Rewrite using variables**: Let \( a = 123 \) and \( b = 77 \). Thus, the expression can be rewritten as:
\[
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