48 lines
619 B
Plaintext
48 lines
619 B
Plaintext
ans
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003675
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$(-\infty,0)$
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031239
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$\dfrac 23$
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031240
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$\dfrac{2\pi}3$
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031237
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$\dfrac 35$
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004256
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$(-\infty,-1]\cup [0,+\infty)$
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004499
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$0217$
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004132
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$[-3,1]$
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004217
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$36$
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008972
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B
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009082
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D
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012445
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B
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030691
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B
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011301
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(1) $c=8$; (2) $6\sqrt{6}$
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003691
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(1) $935$辆; (2) 因$8782>8736$, 故第$42$个月底单车保有量超过了容纳量
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011450
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(1) $x=\dfrac{\sqrt{2}}2$或$x=-\dfrac{\sqrt{2}}2$; (2) $x_1^2+x_2^2=1$, $y_1^2+y_2^2=2$; (3) 不存在, 证明略.
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031236
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(1) $y=x$; (2) $g'(x)=\mathrm{e}^x(\ln (x+1)+\dfrac 1{x+1}+\dfrac{x}{(x+1)^2})$, 故$g(x)$在$[1,+\infty)$上是严格增函数; (3) 证明略. |