98 lines
1011 B
Plaintext
98 lines
1011 B
Plaintext
ans
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003400
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$(4,5)$
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002329
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$\dfrac{y^2}{25}+\dfrac{x^2}{16}=1$或$\dfrac{x^2}{25}+\dfrac{y^2}{9}=1$
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008873
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(1) $\dfrac{x^2}{100}+\dfrac{y^2}{64}=1$; (2) $\dfrac{x^2}{6}+\dfrac{y^2}{4}=1$; (3) $\dfrac{x^2}8+\dfrac{y^2}4=1$或$\dfrac{y^2}8+\dfrac{x^2}4=1$
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002342
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$\sqrt{3}-1$
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010673
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$\dfrac{x^2}{5.9^2}+\dfrac{y^2}{5.8^2}=1$(以$1\times 10^8\text{km}$为单位)
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002325
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$2x+4y-3=0$
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004717
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B
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002348
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$(-\sqrt{5},0)$或$(\sqrt{5},0)$
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009985
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$6$
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009830
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A
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009832
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(1) $\dfrac{x^2}{25}-\dfrac{y^2}{3}=1$; (2) $\dfrac{x^2}{16}-\dfrac{y^2}9=1$
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002372
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$\dfrac{x^2}{64/9}-\dfrac{y^2}4=1$
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003431
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$3$
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008952
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斜率为$2$, 但是判别式小于零, 故直线不存在.
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007380
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C
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003666
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D
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007455
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$120$
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007502
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$20$
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007521
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$2520$
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010861
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$24$
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009333
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$375$
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007673
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$78120$
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002537
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$3720$
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002586
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$45213$, $88$
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007432
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(1) $72$; (2) $72$; (3) $72$
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002563
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$1-\dfrac{1}{(n+1)!}$
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009262
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(1) $6$; (2) $5$; (3) $4$
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007476
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$3$或$6$
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007494
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证明略
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003640
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$\dfrac{27}{100}$
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009351
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$\dfrac{11}{21}$
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003574
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$0.985$
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