Đáp án: $\left[\begin{array}{l}x=-2,237851136\\x=0,5742931751\end{array}\right.$
Giải thích các bước giải: $x-\frac{1}{x^3}+1+2x+\frac{3}{x^2}+x=2x+\frac{4}{x}+1-\frac{2}{1}\\\Leftrightarrow (x-\frac{1}{x^3}+1+2x+\frac{3}{x^2}+x-2x-\frac{4}{x}-1+\frac{2}{1})x^3=0\\\Leftrightarrow 2x^4+2x^3-4x^2+3x-1=0\\\Leftrightarrow \left[\begin{array}{l}x=-2,237851136\\x=0,5742931751\end{array}\right.$
