86 lines
875 B
Plaintext
86 lines
875 B
Plaintext
ans
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18237
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A
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18238
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D
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18239
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B
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18240
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C
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18241
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D
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18242
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D
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18243
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B
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18244
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C
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18245
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C
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18246
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B
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18247
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$1$
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18248
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$\dfrac{x^2}{2}-\dfrac{y^2}{2}=1$
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18249
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$\dfrac{9\pi}{4}$, $\dfrac{\pi}{3}$
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18250
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$48$, $384$
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18251
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\textcircled{2}\textcircled{3}
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18252
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(1) 证明略; (2) $\dfrac{\pi}{3}$
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18253
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(1) $\varphi=-\dfrac{\pi}{3}$; (2) 选条件\textcircled{1}不能使函数$f(x)$存在, 条件\textcircled{2}\textcircled{3}均可解得$\omega = 1$, $\varphi=-\dfrac{\pi}{6}$
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18254
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(1) $0.4$; (2) $0.168$; (3) 不变的概率最大
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18255
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(1) $\dfrac{x^2}{9}+\dfrac{y^2}{4}=1$; (2) 证明略
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18256
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(1) $a=-1$, $b=1$; (2) 单调递减区间为$(0,3-\sqrt{3})$和$(3+\sqrt{3},+\infty)$, 单调递增区间为$(-\infty, 0)$和$(3-\sqrt{3}, 3+\sqrt{3})$; (3) $3$个
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18257
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(1) $r_0=0$, $r_1=1$, $r_2=2$, $r_3=3$; (2) $r_n=n$($n \in \mathbf{N}$); (3) 证明略
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