7. 研究表明，当人的下肢长与身高的比为0.618时，看起来较美.某女士身高为169cm，其下肢长约为cm(精确到1cm)，就能符合上述比例.
答案
104
8. 如图，C是AB的黄金分割点，那么$\frac {AC}{AB}$与$\frac {AC}{BC}$的值分别是().
A.$\frac {\sqrt {5}+1}{2},\frac {\sqrt {5}-1}{2}$
B.$\frac {\sqrt {5}-1}{2},\frac {\sqrt {5}+1}{2}$
(第8题)
C.$\frac {\sqrt {5}-1}{2},\frac {\sqrt {5}-1}{2}$
D.$\frac {\sqrt {5}+1}{2},\frac {\sqrt {5}+1}{2}$
A.$\frac {\sqrt {5}+1}{2},\frac {\sqrt {5}-1}{2}$
B.$\frac {\sqrt {5}-1}{2},\frac {\sqrt {5}+1}{2}$
(第8题)
C.$\frac {\sqrt {5}-1}{2},\frac {\sqrt {5}-1}{2}$
D.$\frac {\sqrt {5}+1}{2},\frac {\sqrt {5}+1}{2}$
答案
B
