ans


40626
$3$

40627
$462$

40628
$1$

40629
$240$

40630
$\dfrac{31}3$

40631
$2$或$3$

40632
$\mathrm{e}$

40633
$2449440x^6$

40634
$\dfrac{15}{56}$

40635
$(-\infty,1)$

40636
$6790$

40637
$\dfrac{8\sqrt{3}}9$

40638
A

40639
B

40640
C

40641
B

40642
(1) $y=-2x+2$; (2) $[3-\sqrt{6},3+\sqrt{6}]$

40643
(1) $\dfrac 13$; (2) $\dfrac{17}{81}$

40644
(1) $\theta=\dfrac\pi 4$时, $S=\dfrac{2-\sqrt{2}+\sqrt{3}}2R^2$, ``得地率''约为$74\%$; (2) $\theta = \arcsin\dfrac{1+\sqrt{33}}8$时, ``得地率''最大

40645
(1) $b=\sqrt{3}$; (2) $a=2$; (3) $C$的坐标为$(-\dfrac 43,-\dfrac 13)$或$(-\dfrac 43,\dfrac 13)$

40646
(1) $f(x)$是``线性控制函数'', $g(x)$不是``线性控制函数'', 理由略; (2) 是真命题, 理由略; (3) 证明略