63 lines
709 B
Plaintext
63 lines
709 B
Plaintext
ans
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012487
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真
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012488
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$[0,1]$
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012489
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$6$
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012490
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$\dfrac\pi 6$或$\dfrac{5\pi}6$
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012491
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$2$
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012492
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$(3,0)$
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012493
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$12$
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012494
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$\dfrac 54$或$\dfrac 53$
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012495
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$4+2\sqrt{3}$
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012496
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$243$
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012497
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$2018$
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012498
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$(-\dfrac 34,0)$
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012499
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C
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012500
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D
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012501
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A
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012502
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B
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012503
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(1) $\dfrac{2\pi}3$; (2) $\sqrt{3}$
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012504
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(1) $4\sqrt{2}\pi$; (2) 证明略, 角的大小为$\arccos\dfrac{7\sqrt{5}}{20}$
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012505
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(1) $1965$万元; (2) $22.5$万台; (3) 产量均为$30$万台, 利润分别为$840$万元与$860$万元
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012506
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(1) $2\sqrt{2}+2$; (2) $\pm \dfrac{\sqrt{14}}2$; (3) $\sqrt{2}$或$\sqrt{3}$或$\sqrt{\dfrac{1+\sqrt{17}}2}$
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012507
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(1) $[-\dfrac{\sqrt[3]{2}}2,+\infty)$; (2) $(-2,-1)$; (3) $a=-2$ |