Question

1 вычислите
2 решите уравнение?

Answer 1

6+2√5 = (1+√5)²
6-2√5 = (1-√5)²
... = |1+√5| - |1-√5| = 1+√5 - (-(1-√5)) = 1+√5 + 1-√5 = 2
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πx/4 = (π/2) + 2πn, n∈Z
πx = 2π + 8πn, n∈Z
x = 2 + 8n, n∈Z