\frac{x^4+x^2+1}{x^2 4x 5}<0

请输入您的数学问题…… \frac{x^4+x^2+1}{x^2-4x-5}<0

问题

\frac{x ^{4} + x ^{2} + 1}{x ^{2} - 4 x - 5} < 0

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