Ответ:
3. 1) Х² + 10Х + 25 - 9Х = Х² + Х + 25
2) 9m² - ( n - 3m ) ² = 9m² - n² +6mn + 9m² = 18m²-n² + 6mn .
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Ответ:
3. 1) Х² + 10Х + 25 - 9Х = Х² + Х + 25
2) 9m² - ( n - 3m ) ² = 9m² - n² +6mn + 9m² = 18m²-n² + 6mn .