ans

003400
$(4,5)$

002329
$\dfrac{y^2}{25}+\dfrac{x^2}{16}=1$或$\dfrac{x^2}{25}+\dfrac{y^2}{9}=1$

008873
(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$\dfrac{y^2}8+\dfrac{x^2}4=1$

002342
$\sqrt{3}-1$

010673
$\dfrac{x^2}{5.9^2}+\dfrac{y^2}{5.8^2}=1$(以$1\times 10^8\text{km}$为单位)

002325
$2x+4y-3=0$

004717
B

002348
$(-\sqrt{5},0)$或$(\sqrt{5},0)$

009985
$6$

009830
A

009832
(1) $\dfrac{x^2}{25}-\dfrac{y^2}{3}=1$; (2) $\dfrac{x^2}{16}-\dfrac{y^2}9=1$

002372
$\dfrac{x^2}{64/9}-\dfrac{y^2}4=1$

003431
$3$

008952
斜率为$2$, 但是判别式小于零, 故直线不存在.

007380
C

003666
D

007455
$120$

007502
$20$

007521
$2520$

010861
$24$

009333
$375$

007673
$78120$

002537
$3720$

002586
$45213$, $88$

007432
(1) $72$; (2) $72$; (3) $72$

002563
$1-\dfrac{1}{(n+1)!}$

009262
(1) $6$; (2) $5$; (3) $4$

007476
$3$或$6$

007494
证明略

003640
$\dfrac{27}{100}$

009351
$\dfrac{11}{21}$

003574
$0.985$