1. 已知 \(x - \frac{1}{x} = 1\)

\(x^{2020} - \frac{1}{x^{2020}}\) \(\sqrt[3]{5+x} +\sqrt[3]{4+x} = 3\) \(\sqrt{x^2+4} + \sqrt{(12-x)^2+9}=5\)