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[函数] 求函数的值域

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yoyo987654 Post time 2023-11-7 22:57 |Read mode

请教方法

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战巡 Post time 2023-11-8 14:43

\[y=\frac{sign(x)}{\sqrt{1+\frac{2}{x}+\frac{4}{x^2}}}\]
剩下就是分$x\ge 0$和$x<0$慢慢研究

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facebooker Post time 2023-11-9 19:04

判别式法或者三角换元

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