共計2.5小時考試時間
此套試卷由三部分題目組成
4題簡答題,每題4分
4題挑戰題,每題6分
4題解答題,每題10分
共計12題,滿分80分
不可使用任何計算器
完整版下載鏈接見文末
A2. Triangle ABC has integer side lengths and perimeter 7. Determine all possible lengths of side AB.
Solution: By the triangle inequality, the largest possible length of any side is 3. Moreover, if all side lengths were less than 3, the perimeter would be less than 7. Thus, at least one side has length 3. This leaves the other sides has (2,2) or (1,3). Thus, AB can be 1, 2, or 3.
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