2010-I-17
答案:(a) (i) $D=(-6,8)$, 圓心 $=(1,7)$ (ii) $5\sqrt{2}$ (b) (i
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\begin{equation*}
\frac{0}{3},~\frac
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= & \$40~000\times (
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= & \dfrac{1}
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= & 8\times 5 + 3 \times 7