今日阅读范围：P1 ~ P28
Chapter 1 : 计算机系统漫游 - 习题
1.1
A.
$$
T_{\text {new}} = \frac {1500 \text {km} } {150 \text {km} \cdot \text {h} ^ {-1}} + \frac {(2500 - 1500) \text {km}} {100 \text {km} \cdot \text {h} ^ {-1}} = 20 \text h
$$
$$
T_{\text {old}} = \frac {2500 \text {km}} {100 \text {km} \cdot \text {h} ^ {-1}} = 25 \text h
$$
$$
S = \frac {T_{\text {old}}} {T_{\text {new}}} = 1.25
$$
固加速比为 $1.25 \times$
B.
$$
S = \frac {25} {10 + \frac {1500} {v}} = 1.67 \approx \frac 5 3
$$
$$
v = 300
$$
固，速度需为 $300 \text {km / h}$
Correct
1.2
$$
S = \frac {T_{\text {old}}} {T_{\text {new}}} = \frac {T_\text {old}} {0.8 T_\text{old} / k + 0.2 T_\text {old}} = 2
$$
$$
k = \frac 8 3
$$
Correct
