Ответ:

3) (6xy³)³

5) x⁷

6) 144/27*a⁵b⁷c⁹

7) x₁,₂ = (1 ± √5)/2

Объяснение:

3) 3x²y * 72xy²⁶ = 216x³y²⁷ = (6xy³)³

5) ((x¹⁷)³ * x⁵)/x⁴⁹ = x⁵⁶/x⁴⁹ = x⁷

6) (2/3*ab²c³)³ * 18a²b = 8/27*a³b⁶c⁹ * 18a²b = 144/27*a⁵b⁷c⁹

7) x² = x + 1

x² - x - 1 = 0

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D = b² - 4ac

D = (-1)² - 4 * 1 * (-1) = 1 + 4 = 5

x₁,₂ = (-b ± √D)/(2a)

x₁,₂ = (1 ± √5)/2