70 lines
948 B
Plaintext
70 lines
948 B
Plaintext
ans
|
|
|
|
14826
|
|
$5$
|
|
|
|
14827
|
|
$\dfrac 43$
|
|
|
|
14828
|
|
$\{1\}$
|
|
|
|
14829
|
|
$\pi$
|
|
|
|
14830
|
|
$\dfrac 14$
|
|
|
|
14831
|
|
$1$
|
|
|
|
14832
|
|
$3$
|
|
|
|
14833
|
|
$\dfrac 52$
|
|
|
|
14834
|
|
$2\pi$
|
|
|
|
14835
|
|
$0.9$
|
|
|
|
14836
|
|
$2\sqrt{2}$
|
|
|
|
14837
|
|
$(0,4)$
|
|
|
|
14838
|
|
B
|
|
|
|
14839
|
|
B
|
|
|
|
14840
|
|
C
|
|
|
|
14841
|
|
D
|
|
|
|
14842
|
|
(1) 相交; (2) $5\sqrt{5}+8$
|
|
|
|
14843
|
|
(1) $f(x)=\dfrac{\sqrt{2}}2\sin (2x+\dfrac\pi 4)+\dfrac 12$, 最大值为$\dfrac{1+\sqrt{2}}2$, 当且仅当$x=\dfrac\pi 8+k\pi$, $k\in \mathbf{Z}$时取得; (2) $A=\dfrac\pi 4$, $B=\dfrac\pi 3$, $AC=\sqrt{6}$
|
|
|
|
14844
|
|
(1) 中位数$M=42.5$, 列联表如下: \begin{tabular}{|c|c|c|}
|
|
\hline & 超过$M$& 不超过$M$\\
|
|
\hline 上班时间 & 10 & 10 \\
|
|
\hline 下班时间 & 11 & 9\\
|
|
\hline
|
|
\end{tabular}; (2) $\chi^2=0.1$, 无显著差异
|
|
|
|
14845
|
|
(1) $P(4a^{\frac 13},4a^{\frac 23})$; (2) $1$; (3) $2\sqrt{2}$或$\dfrac{\sqrt{2}}4$
|
|
|
|
14846
|
|
(1) 证明略 (2) $(\pi,\pi+3\sqrt{3}]$; (3) 证明略, 反之不一定成立, 如取$a_n$是常数$a$, 满足$a+2\sin a=\pi$(这样的$a$有三个)
|