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mathdeptv2/工具/文本文件/metadata.txt

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ans
17465
$\{-1,1\}$
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$\dfrac{\sqrt{2}}{2}$
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$(-\infty,-3]\cup (1,+\infty)$
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$-\dfrac{1}{8}$
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$\pi$
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$x=4$
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$28$
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$8.5$
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$(-3,+\infty)$
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$95.5$
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$(-4,0)cup \{2\sqrt{2}-2\}$
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$1518.5$
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A
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D
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B
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B
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(1) $a_n=n$, $b_n=2^{n-1}$; (2) 证明略
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(1) $\dfrac{\pi}{4}$; (2) $\dfrac{\sqrt{3}}{3}$
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(1) $y=27\times (\dfrac{4}{3})^x$, $x\ge 0$; (2) $9$分钟
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(1) $6$; (2) $-4$; (3) $(2,0)$或$(-\dfrac{2}{7},-\dfrac{12}{7})$
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(1) 证明略; (2) $\dfrac{\mathrm{e}}{2}$; (3) $(-\dfrac{27}{\mathrm{e}^3},0)\cup (0,+\infty)$