√9 = √(3 * 3) = √3² = 3,
√9 = √(-3 * (-3)) = √(-3)² = -3,
ответ: √9 = ±3
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√9 = √(3 * 3) = √3² = 3,
√9 = √(-3 * (-3)) = √(-3)² = -3,
ответ: √9 = ±3