66 lines
573 B
Plaintext
66 lines
573 B
Plaintext
ans
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17423
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$-\dfrac 45$
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17424
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$(\dfrac 12,1)$
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17425
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$160$
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17426
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$9$
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17427
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$0$
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17428
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$\dfrac{\sqrt{6\pi}}{6}$
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17429
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$5$
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17430
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$\dfrac{2\sqrt{3}}{3}$
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17431
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$\dfrac{2}{3}$
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17432
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$4\sqrt{2}-3$
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17433
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$3+\dfrac{5\sqrt{3}}{3}$
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17434
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$(-1,0)$
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17435
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A
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17436
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C
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17437
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B
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17438
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A
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17439
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(1) $\dfrac 12$; (2) $(\dfrac{\sqrt{3}}{2},1]$
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17440
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(1) $4\sqrt{3}$; (2) 证明略
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17441
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(1) $\dfrac 57$; (2) $E[X]=1$, $D[X]=0.8$
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17442
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(1) $x^2-\dfrac{y^2}{3}=1$; (2) $1+\sqrt{2}$; (3) $(\sqrt{2},+\infty)$
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17443
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(1) $m=9$; (2) $\dfrac{4\sqrt{3}}{9}$; (3) 不存在, 证明略
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