64 lines
671 B
Plaintext
64 lines
671 B
Plaintext
ans
|
|
|
|
15038
|
|
$0$
|
|
|
|
15039
|
|
$(1,2)$
|
|
|
|
15040
|
|
$y=\pm \dfrac 43 x$
|
|
|
|
15041
|
|
$\dfrac\pi 4$
|
|
|
|
15042
|
|
$10$
|
|
|
|
15043
|
|
$3-\mathrm{i}$
|
|
|
|
15044
|
|
$-19$
|
|
|
|
15045
|
|
$\dfrac 12$
|
|
|
|
15046
|
|
$8$
|
|
|
|
15047
|
|
$(0,\dfrac 56]$
|
|
|
|
15048
|
|
$(2-\sqrt{2},3)$
|
|
|
|
15049
|
|
$\sqrt{29}-2$
|
|
|
|
15050
|
|
D
|
|
|
|
15051
|
|
C
|
|
|
|
15052
|
|
B
|
|
|
|
15053
|
|
B
|
|
|
|
15054
|
|
(1) $2$; (2) $2+\dfrac 23\sqrt{3}$
|
|
|
|
15055
|
|
(1) $\arctan \dfrac 12$; (2) 证明略, 距离为$\dfrac{2\sqrt{5}}5$
|
|
|
|
15056
|
|
(1) 分布为$\begin{pmatrix}600 & 900 \\ \dfrac 35 & \dfrac 25\end{pmatrix}$; (2) 当$n$为$600$时, $Y$的期望达到最大值, 最大值为$3000$元
|
|
|
|
15057
|
|
(1) $\dfrac{x^2}{4}+y^2=1$; (2) $x^2+y^2=6-2\sqrt{5}$; (3) $\sqrt{5}-1$
|
|
|
|
15058
|
|
(1) $\lambda=-1$; (2) $k=1$; (3) $(-\infty,-1)$ |