\left[x _{4}\right] = \left[ \frac{\frac{ - \sqrt[3]{350}}{10}+\left( \frac{-1}{10}\,i \right) \,\sqrt{3}\,\sqrt[3]{350}}{\sqrt[3]{2}}\right][x4]=[3√210−3√350+(10−1i)√33√350]
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