答案彙整
1. 45
2. \sqrt{5}
3. 3961
4. 5
5. \frac{8-\sqrt{3}}{10}
6. \frac{52}{3}\pi
7. \frac{a+b+c}{2}
8. \left ( \frac{2}{\sqrt{3}}\left ({log_{2}}^{3}-1 \right ),-\frac{3}{2}{log_{2}}^{3}+2 \right )
9. \left\{\begin{matrix}
s_{1}=\frac{1}{4}sin4\theta \\
s_{2}=sin2\theta
\end{matrix}\right.
10. a< 0
11. \left\{\begin{matrix}
x=3+2t\quad\qquad\\
y=4+3t\quad t\in \mathbb{R}\\
z=7+4t\quad\qquad
\end{matrix}\right.
12. 364
13. 8003
14. P_{n+1}=-\frac{1}{7}P_{n}+\frac{2}{7}
15. 19\frac{13}{25}
16. -61
17. 2
18. 6ab+\frac{3\sqrt{3}}{2}\left (a^{2}+b^{2} \right )
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