Ответ:
1. a² - x²
2. (x - a)² = x² - 2аx + a²
3. m² - n² = (m - n)(m + n)
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Ответ:
1. a² - x²
2. (x - a)² = x² - 2аx + a²
3. m² - n² = (m - n)(m + n)